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Clear flint pressed glass glows green under uv light is it due to uranium help

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bungie60:
Checking some bits of uranium glass yesterday and noticed a clear glass candle stick reacted, so checked some more pieces, some did and some did not.I have never known this to happen before it has always glowed purple or bluish, could it be contaminated or was uranium or some other chemical added to the clear glass for some reason. Is it rare and can the makers be identified by the pictures, would it help if you knew who made them was it standard practice. I know some Scottish paperweights glow but i think this is crystal glass. I am at a loss all help and input greatly appreciated.
p.s in plain English please
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10107
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10105
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10111
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10113
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10109
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10101
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10114
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10110
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10112
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10115
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10108
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10102
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10103
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10104

Lustrousstone:
The greenish glow in your clear glass (including paperweights) is caused by the presence of a manganese compound. This was very commonly used as a decolorising agent; clear glass often naturally has a greenish colour cast like Coke bottles. Other decolorising agents are generally used instead these days.

This yellowish green glow can be found with other glass colours, including green, so unless your green glow is really really bright green, you can't attribute it to uranium. Uranium always glows the same shade of bright green, no matter how little was used. The glowing just looks a little diluted.

This is the sort of glow uranium gives, your photos are excellent examples of the glow manganese gives in glass of any colour

Managanese is also what causes clear glass to develop that greyish or purplish tinge (or even a very bright purple tinge but not in the UK, not enough sun or UV rays). The ultraviolet light causes a chemical reaction that turns the manganese compound from a colourless one to a purple one,

bungie60:
Thanks for the reply Christine very intresting so basically what you are saying is that the added manganese is what is making these items glow. The one set of candlesticks i have managed to identify as sowerby regd 752847 the plainer set which glows better than the rest. also the tray came with the sticks which glows well. And thanks for comments on photographs if you can use them to educate other people please feel free.here is a link to some uranium glass i have. learning something new every day yours Mark
 http://glassgallery.yobunny.org.uk/displayimage.php?pos=-10134

Lustrousstone:
You've got a nice collection there.  :) I do wonder if your blue Fenton hobnail thingy is really uranium or whether that's showing a manganese glow.

bungie60:
Wish i had access to a Geiger counter it really did glow brightly. I do recall reading on one of the American sites that it was a rare blue uranium vase by Fenton, but with out backing it up with a Geiger counter i will never know. Thanks once again for info yours Mark

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