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Dating uranium glass

The European definition describes vaseline glass as any kind of creamy yellow glass shading to white with a colour that resembles the original vaseline ointment. In experiments with uranium as a glass colourant were being carried out by Whitefriars Glass Works in London and in a pair of uranium glass candlesticks were presented to the Queen. Also in the 19th century, Davidsons glass produced a glass called pearline that contained uranium and was made with heat sensitive chemicals that turned milky white when reheated, producing a shading effect from yellow to milky white at the edges. American collectors consider any kind of glass which glows under ultra-violet light because it contains uranium, as vaseline glass. The addition of the Uranium Dioxide makes the glass color yellow-green.
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Uranium Glass Identification Guide + Gallery

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Testing Antiques and Collectibles With a Black Light

Many antique lovers use long wave black lights to date objects and test for authenticity. Some clues to age or telltale signs of repair aren't easily visible to the naked eye but will be thanks to fluoresce under ultraviolet light. While it's not the end-all answer in antique authentication and dating, it is a very good place to start. Hard-paste porcelain should fluoresce a deep blue or purple color, while soft paste will glow white.
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How to identify uranium glass

Hazel-Atlas eventually grew to become one of the largest glass manufacturing firms in the world, probably second in the United States, behind Owens-Illinois Glass Company with 14 glass plants operating simultaneously. The Plainfield plant was later sold to A. Kerr Glass Company.
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Over the years, as dealers in glassware, we have taken thousands of pictures of glass vases, bowls, paperweights, sculptures and other glassware. After we have sold an item, it seems a shame to throw those pictures away, so we use them to create an encyclopaedia guide in the galleries shown below. We hope they will enable you discover more about the types of glass products that you are interested in collecting, or help you to identify a glass item you have come across. Please note, we are well aware that there are some gaps, for instance, we don't have much on French or American glass, this is simply because, as glass dealers in the UK, we don't come across that much of it, so we don't have many pictures with which to create a guide. Our glass encyclopaedia is aimed to be as accurate as possible.
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