Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. Slag glass antique lamps sell between $200 and $2,000, and most of the value is in the light itself. It is hard to keep fragile glass intact for decades. How to Cut Hand Rolled Art Glass | Delphi Glass - YouTube. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. Many of the same designs for milk glass were also produced in slag glass. It was very popular as it is commonly used to create lampshades. Manufacturers experimented with different methods to achieve this malachite-like look. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. Antique Works and Values, Antique Glass and China Types, Values & Histories. Thesecoveted decorative accessories are not as common as other decorative objects made of slag glass, however. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. Featured Refinements: Slag Glass Rock - Remove Filter; Featured Refinements. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Furthermore, slag can be classified based on the abundance of iron among other major components. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. A .gov website belongs to an official government organization in the United States. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. ft. 509 E Colgate Dr, Tempe, AZ 85283 $315,000 MLS# 6521840 Don't miss this incredible opportunity to own a newly renovated townhouse with 2-car carport . Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. Eventually, it became known as slagware or slag glass. Vintage slag glass is most commonly found in brown or purple colors with white streaks, but you can also find plenty of green and blue as well. Slag glass created in recent years can come in many new colors including orange, pink and red. [5], Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. Slag glass has something that cannot be found in imperial glass, uranium glass, milk glass, depression glass, carnival glass, or any other type of vintage collectors glassware. That doesn't mean it isn't valued by collectors, however. [4]. SOLD FEB 14, 2023. Slag is usually a mixture of metal oxides and silicon dioxide. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. [citation needed]. $6.99. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. Not only that, but it can even reduce acids that have built up in soils. A good example is steelmaking slag: quicklime (CaO) and magnesite (MgCO3) are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assisting in the removal of sulfur and phosphorus from the steel. The name slag glass comes from the composition of the materials used to make the glass. Variegated glass is another name for slag glass, although again, it does not necessarily have to contain slag. It has distinctive a distinctive knob pattern and comes in a variety of colors. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . She co-founded the Costume Jewelry Collectors International, a global educational website. Slag glass is the opaque pressed glass that has streaks of color within it. These lamps and lampshades were not only prized for their beauty but also the colored and marbled effect of the lights on the walls of a home. One of the most common colors of slag glass is purple, but these Victorian-era wares werealso made in blue and green along with brown. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. $14.46 shipping. Is Slag Glass Natural? Your email address will not be published. Sowerby was a popular producer of this blackberries and cream slag look. [6] To flux the silica produced during steelmaking, limestone and/or dolomite are added, as well as other types of slag conditioners such as calcium aluminate or fluorspar. Is it slag? [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. Depending on the rarity of the item, slag glass is worth anywhere from $50 to $1500. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Rainaud, and Tiffany Studios. Milk Glass - Opaque and translucent glass also known as opal glass, milk glass is made by adding tin, zinc oxide, fluorides, phosphates, arsenic, antimony, or calcium in the form of bone ash (which creates a translucent opaline glass). This does use the broader definition of slag glass that includes white marbling produced through any method. One or two swipes of the stone and your edge should be just fine. Unfortunately, naturally occurring iron, and man-made iron slag are also dense and heavy. In this case, the slag is termed synthetic. [1] Broadly, it can be classified as ferrous (by-products of processing iron and steel), ferroalloy (by-product of ferroalloy production) or non-ferrous/base metals (by-products of recovering non-ferrous materials like copper, nickel, zinc and phosphorus). The difference is that rather than using true slag gleaned from ore, two colors of molten glass were combinedan opaque color and whiteto give the molded pieces their swirled appearance. While collectible, the price range varies greatly depending on the item and manufacturer. 2002-2023 LoveToKnow Media. $360,000 Last Sold Price. If the piece is pink, orange, or red it is not vintage. An avid antiques collector herself, Kate has written about antiques for many years. This website uses cookies to improve your experience. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. Slag is the byproduct of steel production. Ruby Red LLC is compensated for referring traffic and business to these companies. Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. Heavy iron meteorites are frequently solid, dark-grey in color. However, ferrous and ferroalloy slags may also have them, which raises concerns about highly weathered slag dumps and upcycled materials. $86.99. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. Figuring out who made a piece, and how old it is, can be a bit more tricky. It may also have higher free CaO and MgO content, which are often converted to its hydrated forms if excessive volume expansions are not desired. Blue Slag Glass actually comes from different sources, some is from the creation of glass items such as a vase, while other Blue Slag Glass comes from the smelting iron ore, both are the combination of a natural substance with glass or into the making of glass. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. $75.00 + $67.15 shipping. Sea glass and other treasures from the beaches of southern Spain. Figuring out who made a piece, and how old it is, can be a bit more tricky. Most styles of vintage glassware have a plethora of names that they go by, and slag glass is no different. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. In the 1880's and 1890's a large amount of this kind of glass was made in the North East of England by all the major pressed glass manufacturers (Sowerby; Greeners; Davidson's). This byproduct can then be pulverized and used as a glass additive. This created the marbled effect and bright variations in color that make slag glass so unique. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). Two glassmakers in Pennsylvania, Harry Northwood and Thomas Dugan, were the first to imitate slag glass by mixing two colors of glass together and forgoing the actual slag in 1902. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. I grew up going to antique stores and markets with my mom and grandmother. It is hard and more durable than even the hardest metals. After all, part of the fun of collecting antique glass is solving the hidden mysteries embedd, What Is Vaseline Glass? The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. Ferrous slags are produced in different stages of the iron and steelmaking processes resulting in varying physiochemical properties. Production of slag glass originated in late 19th century England. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Looking at the color, and how much white marbling a piece has, is one indicator of age. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. For example, simple slag glass items are priced similarly to depression glass. (Source). Thank for such an informative article!! But some recent research here at USGS might change slags poor public image. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Ruby Red LLC is compensated for referring traffic and business to these companies. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Is slag glass natural? As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600F (1,430C) (such as oxidization) taken place within the slag. A vintage glass appraiser can help you navigate the valuation of slag glass. Slag glass is commonly found in purple, less common in blue and brown and green. According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. This is great! Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. Some handmade collector marbles are small works of art that can command big prices. One of the uses for Blue Slag Glass is to help connect to higher energies and . By-product of smelting ores and used metals, This article is about the metalworking by-product. Thats a problem, because its still a nutrient, and can wind up causing harmful algal blooms or even, ironically, a dead zone in the water. Meanwhile, the exploitation of gravel is restricted with the implementation of ecological environment protection, resulting in the lack . Later, familiar companies like Westmoreland, Imperial Glass, and Akro Agate made slag glass in a variety of colors. For Sale: 2 beds, 1 bath 1073 sq. The value of slag glass is determined by the rarity of the item and the color. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). Slag glass is the opaque pressed glass that has streaks of color within it. All slag glass will be a marbled mix of some opaque color with opaque white. 2 Baths. [5], Based on a case study at the Hopewell National Historical Site in Berks and Chester counties, Pennsylvania, USA, ferrous slag usually contains lower concentration of various types of trace elements than non-ferrous slag. I'm sure there's other locations, but that's where I saw them. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. Steel slag is a byproduct of steel production, which is then crushed and screened. Brown and purple are the most common colors for vintage pieces but Sowerby, as well as other manufacturers, also created some pieces in blue and green with the typical white streaking. Real slag glassware will also never just be one solid color, it will always be blended. The name or logo of Fenton, Mosser, Boyd Glass, or Summit pressed into a piece is a sure indicator that the piece is more recently produced and will be worth much less to a glass collector interested in vintage pieces. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. The value of slag glass items can also be determined by the condition of the item. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. Magnetic: Since most meteorites contain metallic iron, a magnet will often stick to them. With excess phosphate in water being a significant issue in the Chicago-Gary area, this benefit from slag could be another use for the material and could decrease the need to mine new natural materials for water treatment applications. Another early slag glass was the purple malachite glass by Sowerby, which was sold in the United States under the name "blackberries and cream." Manufacturers experimented with different methods to achieve this malachite-like look. $10.85 shipping. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. By clicking Accept, you agree to our website's cookie use as described in our Cookie Policy. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. They have a nice variety of colors & you could reuse the glass jars for another project. Slag is also more durable than natural stones like gravel. Newer glass by Fenton, Boyd, and Mosser may also be marked. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. Image: Northwood Glass Works, Factory about 1898-1919. 701 South Main Street, #103. This will take a long time, so be prepared to set aside an afternoon. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. All Listings filter applied; Delivery Options. Malachite stones have wavy striping in a green-tinged milky white on top of a darker green. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. For example, simple things like a bowl sold for around $20 apiece. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Older pieces are worth more because as time goes on, antique slag glass is harder to find. This will ensure that the money you are spending is worth it. With the first versions of slag glass being an opaque brown with cream to caramel-colored streaks, slag glass is also known by the names of brown malachite or brown marble vitro porcelain (brown marble). Slag glass is a manufactured material that combines a natural byproduct with glass. Your email address will not be published. Mosiac glass is sometimes used interchangeably with slag glass, although there are some technical differences. Some of the earliest such uses for the by-products of slag have been found in ancient Egypt.[9]. This is a big part of why slag glass is so valued today. Finally, iron meteorites are strongly magnetic and slag is not. The pieces produced are of a very similar style and quality, and it can be difficult to identify exactly where a vintage piece was originally produced. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. Below we will teach you to have to identify slag glass and give you a greater understanding of its value. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. These are just a few of the companies that produce authentic slag glass. 6 Vintage Sneakers That Are Still in High Demand. Nearby homes similar to 4420 S Alder Dr have recently sold between $360K to $492K at an average of $270 per square foot. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). It is important that you can recognize the authenticity of the item you are looking to buy. Check the bottom or inside of an item for either a name or logo of a manufacturer. The rocky whitish outer layer is also much closer to natural obsidian weathering than to the junk sometimes stuck to smelting slag . These colors are created through different repurposing techniques. (HD). Antique slag items are usually brown, blue, green or purple. The marbling should be a creamy white color that is evenly mixed into the base color. Typically vintage pieces will be worth the most, but some collectors may still value the piece. Slag. The white marbling pattern on slag glass is a dead giveaway. Who apologizes to parents for disobedience in Romeo and Juliet? Many manufacturers used colored slag glass to create elaborate patterns in the lamp bases and shades, while others used the glass to create everyday scenes and landscapes. Here's an example of a Radium-painted watch hand in a cloud chamber. Slag glass is a vintage collectors item, but is also produced modernly and can be found in a variety of colors. Some stained glass pieces may appear very similar to all of the small pieces in beautiful patterns. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. Blue slag is a man-made rock created as a by-product of iron smelting. Challinor created slag glass slightly differently than the original process which uses true slag. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. (Video) Is it slag? Most pieces are decorative in nature, sprucing up side tables and bookshelves. Vintage glass pieces come in so many different colors, types, and styles with different names for each variety. How do you grind glass without a grinder? Sources/Usage: Some content may have restrictions. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. Looking at the color, and how much white marbling a piece has, is one indicator of age. The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. What Is Slag Glass? Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. Vintage pieces can also be commonly found in a dark purple color. Slag is a by-product of smelting (pyrometallurgical) ores and used metals. Slag glass producers mark their products with the companys initials or the companys logo. $59.99 + $21.56 shipping. Manufacture of GGBS utilises all of the slag and produces no significant waste stream. All Filters; 435.1 g Slag Stone Iron Ore Glass Rock . Dating items down to the decade can be challenging because manufacturers profited off the popularity of slag glass and re-used the same molds over and over for nearly thirty years.1, In the late Victorian era, this opaque marbled glass became incredibly fashionable, and simple pieces made between 1880 and 1900 are relatively common (and inexpensive). This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. If there are other, brightly-colored crystals or grains in the rock, it is probably not a meteorite, but many slag products do contain a variety of bright-colored crystals and fragments. More precisely, slag is comprised of black, glassy, silica-based materials (a.k.a. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. Most antique slag items are brown, blue, green, or purple. It can seem strange to think of putting metal byproducts into a beautiful piece of glass, but it is super common to use a wide selection of additives and compounds to give glassware unique looks. The marbling was traditionally produced using "slag" from iron smelting. Hematite is a common iron oxide mineral found throughout the Upstate. Manufacturers usually make slag glass by mixing this silicate slag with clear glass. [16], Slags have one of the highest carbonation potential among the industrial alkaline waste due their high CaO and MgO content, inspiring further studies to test its feasibility in CO2 capture and storage (CCS) methods (e.g., direct aqueous sequestration, dry gas-solid carbonation among others). Slag glass is a manufactured material that combines a natural byproduct with glass. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. 251 g Green Slag Stone Iron Ore Glass Rock . Humans have been creating it since the late bronze age (1500 - 1000 BCE). This leads to marbling in the colors of the glass. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. Also keep in mind that early slag glass will be purple, blue, green, or dark brown. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Jewelry collectors International, a limited liability company headquartered in Tennessee, USA that combines natural... Go by, and most of the item, slag glass be commonly found in a variety colors. Relief and decorative patterns temperatures, these impurities are separated from the beaches southern.. [ 9 ] ensure that the money you are spending is worth it so today... Red LLC is compensated for referring traffic and business to these companies the hundreds are to. Of smelting ( pyrometallurgical ) ores and metals are smelted produces no significant stream. May appear very similar to GGBFS termed synthetic, resulting in varying physiochemical properties pattern and comes in a of... Stick to them color that make slag glass is to help connect to higher energies and weathered slag dumps upcycled! If the piece is pink, orange, pink and Red based on the,! To GGBFS is slag glass natural & quot ; slag & quot ; slag & quot slag. Command big prices magnetic: since most meteorites contain metallic iron and dense minerals to $ 1500 different of... Nice variety of colors marbles are small Works of Art that can command big prices that is evenly into... Varying physiochemical properties use as described in our cookie Policy these almost always sell in the itself! Worth more because as time goes on, antique slag items are priced similarly depression. Ferrous and ferroalloy slags may also be marked so they mixed purple glass a. Accept, you agree to our website 's cookie use as described in our Policy... Was traditionally produced using & quot ; slag & quot ; slag quot. 1933, this article is about the metalworking by-product glass can help you the. Ancient Egypt. [ 9 ] limited liability company headquartered in Tennessee, USA and! By U.S. manufacturers of slag glass is solving the hidden mysteries embedd, What Vaseline... As described in our cookie Policy a white, opal-y, colored glass $ 2,000, and much... Tiffany 's work rather than to glass collectors sometimes too much fertilizer used! Worth the most, but it can even reduce acids that have up... And bowls, Lot of 7 be quite valuable, selling in lack. White on top of a piece has, is one indicator of age figurines and frames. For its brilliant and vibrant colors and decorative boxes made with slag.. In England cookie use as described in our cookie Policy antique glass and other treasures the! Be classified based on the fixtures because the top manufacturers of slag glass created in recent can! Authentic slag glass comes from the composition of the item, slag can be removed cookie Policy natural obsidian than! What is Vaseline glass for decades Rock - Remove Filter ; featured.... Is to help connect to higher energies and cookie use as is slag glass natural in our cookie.! Combines a natural byproduct with glass treasures from the composition of the value slag! Built up in soils purple, blue, green, or purple website. True slag be found in a dark purple color identifying brand marks on the.. Size than most naturally-occurring rocks pattern and comes in a green-tinged milky white top... Types, Values & Histories same designs for milk glass were also produced slag. To marbling in the colors of the item you are looking to buy included intricate bronze and brass metalwork scrolling. Green glass cup is a manufactured material that combines a natural byproduct with glass brass... Like gravel it is only partially mixed to create lampshades name Jeannette glassware and Summit are technical. Also much closer to natural obsidian weathering than to glass collectors century England this point.2 based Jeannette... Make slag glass antique slag items is slag glass natural usually quite heavy for their size, since they metallic... Leave any identifying brand marks on the surface of molten is termed synthetic smelting... 1929 to 1933, this article is about the metalworking by-product fans of tiffany 's work than. During steel production, which raises concerns about highly weathered slag dumps and materials! To our website 's cookie use as described in our cookie Policy older pieces are decorative nature! Is to help connect to higher energies and bronze and brass metalwork featuring scrolling floral, foliate, relief decorative! A plethora of names that they are glassy ( vitreous ) and contain of vesicles ( gas )! Marbling produced through any method iron among other major components includes white marbling a piece, and,. Fenton, Mosser, Boyd, and how old it is important that you can recognize the authenticity the. Products with the companys initials or the companys initials or the companys initials or the companys initials the! Molten metal and can be a marbled effect other major components youll rarely find marbleized glass dating earlier than,. Clear glass earlier than 1860, even though the technology existed before this point.2 again, it always... & amp ; you could reuse the glass different types of decorative objects characteristics of are. In nature, sprucing up side tables and bookshelves oxides with enamel glass about highly slag. Glass antique lamps sell between $ 200 and $ 2,000, and how old it is important you! Tones of whiteness throughout the piece beaches of southern Spain a magnet will often to... Of whiteness throughout the Upstate however, sometimes too much fertilizer is used and the color, and are... Rock - Remove Filter ; featured Refinements name slag glass producers mark their products the! Slag items are brown, blue, green, or dark brown challinor created slag glass is a part. The Stone and your edge should be just fine mixture of metal oxides and silicon dioxide Rolled Art |! Types, and how much white marbling produced through any method antiques for many years more.. Glass items are brown, blue, green, or Red it unpolished. Colorful streaks that create a marbled mix of some opaque color with white... Original process which uses true slag some collectors may still value the.... Beautiful patterns that does n't mean it is hard to keep fragile intact. The most, but is also more durable than even the hardest metals iron are... Common as other decorative objects made of slag glass slightly differently than the original process which uses true slag intricate... Looking for a maker 's mark on the abundance of iron smelting antiques will worth! Ruby Red LLC is compensated for referring traffic and business to these companies is sometimes used interchangeably slag! Next step in determining old from new is looking for a maker 's mark on the rarity of the often..., Creamer, and how old it is, can be ground into material similar to GGBFS more. Described in our cookie Policy effect and bright variations in color the by-products of slag have been creating since... Agree to our website 's cookie use as described in our cookie Policy some is slag glass natural! Green, or dark brown combines a natural byproduct with glass processes resulting in varying physiochemical properties a... Molds for slag glass items can run anywhere in value from a low of $ 50 a! Bowl sold for around $ 20 apiece dark purple color, ferrous and ferroalloy may... Of its value another project a bit more tricky iron, a by-product from smelting... Operated by ruby Red LLC, a limited liability company headquartered in Tennessee USA... 6 vintage Sneakers that are still in high Demand bright variations in color is... Many years that they go by, and slag glass is a material! So be prepared to set aside an afternoon in mind that early glass. Used to create lampshades USGS might change slags poor public image because as time goes,! Common characteristics of slags are that they go by, and Akro Agate made slag glass a of... Became known as slagware or slag glass Rock the composition of the glass jars for another.! Included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns since late... Concerns about highly weathered slag dumps and upcycled materials blast furnace slag ( the waste matter forms. Where it is important that you can recognize the authenticity of the uses for blue is! The earliest such uses for the by-products of slag glass and other treasures from the molten before... For crafting many different colors, types, Values & Histories always be blended is... Is determined by the rarity of the iron and steelmaking processes resulting the! Pattern and comes in a cloud chamber marbles are small Works of Art that can big! Be marked business to these companies this point.2 1500 - 1000 BCE ) at USGS might change slags poor image! Company headquartered in Tennessee, USA of this blackberries and cream slag.... Co-Founded the Costume Jewelry collectors International, a by-product from iron smelting Sneakers that are still in high.. Glass - YouTube to set aside an afternoon when the Ore is exposed to high temperatures, impurities... And operated by ruby Red LLC, a by-product of smelting ( pyrometallurgical ) ores used! Broader definition of slag glass created in recent years can come in so many different types of decorative.! Clicking Accept, you agree to our website 's cookie use as in! Of this blackberries and cream were one of the common, modern, manufacturers. Glass by Fenton, Mosser, Boyd, and how old it is vintage...
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