I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. (817) 251-1668. On this Wikipedia the language links are at the top of the page across from the article title. One of the most common applications of vintage slag glass is in lighting. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. 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. $14.46 shipping. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. Although, the majority of slag glassware was created as decorative pieces. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. It was also ground into powder to add to glazes for use in ceramics. A lock () or https:// means youve safely connected to the .gov website. Some later manufacturers include Boyd, Imperial, and Westmoreland. I would like to send you pictures, but am not sure how. Initially, it was known as marble glass, malachite glass, or Vitro porcelain. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Slag glass is a man-made opaque base glass with marbelized swirls in a different color. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). A mark for Sowerby, Davidson, or Greeners will indicate a vintage U.K. piece while a mark from Challinor Taylor and Co., Akro Agate, Westmoreland, or Northwood Glass Company indicates vintage U.S. glass. "frit", a high density, vitreous, and abrasive material low in carbon and formed in various shapes from jagged and irregular pieces to rod and needle-like forms) and residual carbon char, the proportions of which vary depending on operating conditions, gasifier, Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. In this case, the slag used for marbling glass is produced when iron is heated during the production process. Slag glass, also commonly known as Malachite glass, is pressed glass made in the same way as Milk glass, but with coloured streaks to create a marble effect. Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. A well-crafted piece of slag glass with the right ratio of additive and correct amount of mixing will strike the perfect balance between looking too chunky and looking too homogenous. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. Not all Fenton slag glass will be worth quite as much, so each piece in a collection should be evaluated based on the style and color. Required fields are marked *. 2023 LoveToKnow Media. Is it slag? Is My Penny Solid Copper or a Copper-Plated Zinc Cent? Sowerby also created several other color formulas including Giallo (yellow), Pomona (green), and Sorbini (blue). Telling slag glass apart from other styles is actually quite simple. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. Identification Tips & History Highlights, One of the most unusual types of antique glass that collectors can investigate, Vaseline glass is absolutely fascinating due to its color, history, and radioactive components. Ruby Red LLC also participates in affiliate programs with Awin and other sites. All rights reserved. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. No additional grinding will be needed and youre ready to foil. This would still give the marble effect without the use of actual slag. Slag glass lamps are one of the most sought-after items made of slag glass. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. Phosphate is an important nutrient for plants and is a key ingredient in most fertilizers. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. Thank for such an informative article!! Thus, clinkers are a form of slag. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. Slag glass is the opaque pressed glass that has streaks of color within it. Through this process, ferrous slag can be broken down into blast furnace slag (produced from iron oxides of molten iron), then steel slag (forms when steel scrap and molten iron combined). The older piece, the greater value it has. 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. Lamps, lampshades, and chandeliers were very popular uses for slag glass. $6.99. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. Similarly, ferrous slags have been used as soil conditioners to rebalance soil pH and fertilizers as sources of calcium and magnesium. The rocky whitish outer layer is also much closer to natural obsidian weathering than to the junk sometimes stuck to smelting slag . Reston, VA 20192 Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. Slag glass gets its name from slag, or the byproduct of steel production. For Sale: 2 beds, 1 bath 1073 sq. The value of slag glass is determined by the rarity of the item and the color. We looked specifically at ferrous slag, the leftover material from the smelting of iron and steel, in the Chicago-Gary area of Illinois and Indiana. [19], However, high physical and chemical variability across different types of slags results in performance and yield inconsistencies. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. I grew up going to antique stores and markets with my mom and grandmother. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. Your email address will not be published. A vintage glass appraiser can help you navigate the valuation of slag glass. [14], Dissolution of slags generate alkalinity that can be used to precipitate out metals, sulfates, and excess nutrients (nitrogen and phosphorus) in wastewater treatment. This material takes on different colors depending on the minerals and elements that are present in the iron. Slag is also more durable than natural stones like gravel. 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). How can I tell if I found a meteorite? What was Juliet's last words before she died? If a lamp has brown malachite colors it can easily sell for around 1000 dollars. Modern slag glass is still being made today in USA, and comes in a variety of colours. Slag glass has a really unique look that sets it apart from many other styles of vintage glassware. This color pattern led to the "brown malachite" and "brown marble" names. Slag glass gets its name from slag. All Filters; 435.1 g Slag Stone Iron Ore Glass Rock . Antique slag items are usually brown, blue, green or purple. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. Older pieces are worth more because as time goes on, antique slag glass is harder to find. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. If glass exists in that color, you can theoretically have slag glass in that color. For Sale: Single Family home, $550,000, 4 Bd, 2.5 Ba, 1,572 Sqft, $350/Sqft, at 1427 E Dava Dr, Tempe, AZ 85283 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. Slag glass is commonly found in purple, less common in blue and brown and green. The term mosaic glass is much more inclusive and includes these pieces that look like slag glass but dont actually contain any slag. Where the slag is really concentrated it will appear milky white. Recognizing slag glass is easy due to the distinctive coloration. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. Another common use for slag glass was for various lighting pieces. 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. Slag glass is a vintage collectors item, but is also produced modernly and can be found in a variety of colors. 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. An avid antiques collector herself, Kate has written about antiques for many years. This is listed on the bottom of most slag glass items, especially lamps. Modern slag glass Cake Stand, antique slag items are usually brown,,... But is also more durable than natural stones like gravel for their.... 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