Some of the most costly slag glass pieces take the form of lampshades by well-known makers like Handel, Bradley Hubbard, and Tiffany. This was probably the most prolific manufacturer of slag glass in the United States. However, it was salvaged, chiseled, polished and transformed into a beautiful, one-of-a-kind piece of art. Meanwhile, imitation slag glass, like this early twentieth-century ashtray, reveals an unusually uniform color. Perhaps the most unique addition to the slag glass market during this period was Ohio-based maker Akro Agate, who had originally earned acclaim for making marbles. There was also Challinor, Taylor & Company, who excelled in smaller slag glass home goods, like these multi-color salt and pepper shakers, from the closing years of the nineteenth century. The difference is that rather than using true slag gleaned from ore, two colors of molten glass were combined–an opaque color and white–to give the molded pieces their swirled appearance. Slags are one of the most natural products of all. Price Guide and History, Early creators of slag glass were rumored to incorporate pulverized fragments of iron slag chunks into their molten glass, before pressing it to accomplish the rich variety of colors seen in these glass pieces. Pamela is an antique expert and the author of three books on the subject. They were used for decorations anywhere, but mostly for aquariums (look up "Aquarium Glass Rock") and landscaping ("Landscaping Glass Rocks"). Slag Glass: Slag Glass from the Glass Encyclopedia Slag Glass: A short explanation "Slag glass" is a collectors' name for opaque pressed glass with coloured streaks, usually white and/or cream streaks like this brown bugle made by George Davidson's in the North East of England in the 1890's. Lot 167: Roycroft/Dard Hunter Extremely Rare Table Lamp, Rago Arts and Auction Center, Lambertville, NJ (17 September 2005) Est: $40,000-$50,000. But how does it get that color, you may ask? Early creators of slag glass were rumored to incorporate pulverized fragments of iron slag chunks into their molten glass, before pressing it to accomplish the rich variety of colors seen in these glass pieces. So celebrated are their designs that they rank among the collections of the world’s most prestigious museums, like this. These are absolutely stunning boulders and crystals of slag glass. Yes, most the glass rocks are made of glass slags which are recycled from glass factories. Medical appointment today. With result is decorative landscape glass is the consistent it its beauty, vividness, and size. However, perhaps the biggest indicator of price is the maker of the work: signed, , can sell in the tens of thousands, while the diminutive and delicate collectibles like this. Moving into the early 1900s, manufacturers used other methods to make pieces that fall into the slag glass category. However, perhaps the biggest indicator of price is the maker of the work: signed Tiffany Lamps, like this spectacular Dragonfly Lamp, can sell in the tens of thousands, while the diminutive and delicate collectibles like this Boyd train set sell for mere dollars. Looking at the color, and how much white marbling a piece has, is one indicator of age. Perhaps the most unique addition to the slag glass market during this period was Ohio-based maker. $18.00. $4.00 shipping. But some recent research here at USGS might change slag’s poor public image. also notes a secondary process, in which the “slag” of slag glass was developed from lingering scraps of glass leftover in the pots of glassmaking factories at the end of each work day. The benefit of this incredible price range is that the slag glass market is accessible for virtually any budget and can satisfy those seeking bold statement pieces as well as smaller accent decorations. It’s the density of the glass … For more affordable vintage collectibles made of slag glass, Akro Agate is a viable option. Whether you use them as part of a water feature or in a gabion retaining wall, the glass rocks will add interest to your space. sell for mere dollars. Secondly, metals start to oxidize as they are smelted, and slag forms a protective crust of oxides on the top of the metal being smelted, protecting the liquid metal underneath. $8.99 shipping. housed at New York’s Metropolitan Museum of Art. (The term “slag” comes from the undocumented belief that slag from iron smelting works was added to the glass to give it color.) There are 3 different colors to choose from darkest is identified as BLUE, medium Blue is ROYAL BLUE, lightest is TEAL BLUE. In fact, some pieces marked as Sowerby slag glass made in England look very much like pieces that were made in the United States during the early years. View our, What is Slag Glass? Slags catch people attention because of their morphology. Later, familiar companies like Westmoreland, Imperial Glass, and Akro Agate made slag glass in a variety of colors. Rock Mulch & More delivers aggregate supplies like 57 limestone gravel, concrete sand, and much more in the Pittsburgh region. The visual marbling of this slag is reminiscent of slag glass, however, the presence of actual slag in slag glass pieces depends on how it was created. She's written over 400 articles on antique collecting for The Spruce Crafts. About Us. Sowerby’s slag glasswares, along with the similar pressed glass designs of contemporaneous English makers Davidson and Greener & Company, are still some of the most coveted today, particularly those that feature their unique brown malachite glass. Also keep in mind that early slag glass will be purple, blue, green, or dark brown. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. If you are looking for mulch or landscaping decoration consider landscape glass. It is perhaps thanks to this novelty that the introduction of slag glass in the later years of the nineteenth century resulted in excitement from, With the export of these beautiful creations to the United States market, nineteenth-century American producers also entered into slag glass production. These types of rocks could be valuable gemstones or minerals that could be used for jewelries or they could also be made into a collection. Coleman's Rocks-R-Gems, 1400 East Grand Avenue, Hot Springs AR 501-624-7280 Edited: 5 years ago Coffee after. FAST 'N FREE. Slag is a byproduct of steel production and is similar in character to volcanic rocks such as basalt and granite. Please call for availability (843-559-5829) due to the shortage at this time. Regardless of which technique was used by various makers, slag glass reflected a brilliant repurposing of materials otherwise resigned to the refuse bin, resulting in some of the most dynamic and eclectic colors known within the glassmaking industry. Like so many fields of collecting, slag glass can be acquired at a wide variety of price points. The Corning Museum of Glass also notes a secondary process, in which the “slag” of slag glass was developed from lingering scraps of glass leftover in the pots of glassmaking factories at the end of each work day. How to Identify Antique and Vintage Glassware Styles, 24 Good Luck Charms from Around the World, How to Identify Modern Versus Contemporary Art, 12 of the Most Extravagant Gifts Ever Given, Louis Vuitton Handbags: Iconic Styles and Price Guide, The Surprising Market for Russian Nesting Dolls. Update your email preferences at any time. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature controlof the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace a… Lot 739: Atterbury & Co. Slag Glass Kerosene Lamp Base, Jeffrey S. Evans & Associates, Mt. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. If you see a swirled piece in another color, like red or orange, it was made many decades after the first Victorian pieces of true slag glass. The size is about that of a quarter (1 & ¼” X ¼”) and is grayish black. Thus, clinkers are a form of slag. "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. Lot 391: A Tiffany Studios ‘Drop-Head Dragonfly’ table lamp circa 1910, Andrew Jones Auctions, Los Angeles, CA (15 September 2018) Sold: $160,000, Lot 30: Tiffany Studios Pine Needle Picture Frame, Toomey & Co. Auctioneers, Oak Park, IL (2 December 2018) Est: $2,000-$4,000. Tumbled in a unique process that creates a vibrant look and color for your yard and landscaping needs. Lot 690: Purple Slag Articles, Lot of Two, Green Valley, Mt. Someone at one of these places should be able to ball you positively identify what you have. For example, Westmoreland conjured this Three Kittens Plate or these multicolored and iridescent “Hen on the Nest” covered dishes, while Boyd developed a specialty for the novelty figurine, like this airplane. As for slumped, it’s glass that’s been fired in a kiln to make it curve. They created beautiful pieces like this striking kerosene slag glass lamp base, from 1860 to around 1900. Slag glass gets its name from slag, or the byproduct of steel production. 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