Author Topic: More 'Vaseline' - ish  (Read 1145 times)

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Offline Leni

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More 'Vaseline' - ish
« on: April 25, 2006, 06:33:20 PM »
This one's a bit of a mystery.  I really don't feel it's English, although I can't say what I think it is!   :? http://glassgallery.yobunny.org.uk/displayimage.php?pos=-1636

It's only very slightly reactive to UV.  I didn't think it was at all, because the colour is not like my other uranium glass, being rather more olive green than most.  However, while checking the intensity of a couple of other little Stourbridge beauties I got today  http://glassgallery.yobunny.org.uk/displayimage.php?pos=-1625  which really 'zing' under UV, I was amazed to notice a very faint glow from this fella (which I call the Ice Cream Cone  :roll:  :lol: )  

The main body - the olive green bit - glows very faintly indeed and the clear and white more so, but still only quite faintly.  

Anybody got any ideas where it might be from?  And is it really Uranium, or could it be some other chemical which causes the glow?   :shock:  :?
Leni


Offline Lustrousstone

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More 'Vaseline' - ish
« Reply #1 on: April 25, 2006, 07:03:12 PM »
I think it's the old manganese glow and not a uranium glow, is it sort of slightly orangey?


Offline Leni

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More 'Vaseline' - ish
« Reply #2 on: April 25, 2006, 07:09:28 PM »
Quote from: "Lustrousstone"
is it sort of slightly orangey?

No, not at all!   :shock:  It's a very pale misty grey-green   :?
Leni


Offline Lustrousstone

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More 'Vaseline' - ish
« Reply #3 on: April 25, 2006, 07:14:26 PM »
I still think manganese, having just drawn the curtains and waved my UV light over a load of old non uranium glass. I meant pale green with a hint of orange, not just orange. Colour is a very subjective thing, after all.


Offline Leni

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More 'Vaseline' - ish
« Reply #4 on: April 25, 2006, 07:24:08 PM »
No; just took husband into the downstairs cloakroom with the light off (ooh, Missus!   :shock: ) and a UV torch and he agrees - for once  :roll:  - there's no orange.  Just a pale sludgey green.
Leni


Offline Lustrousstone

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More 'Vaseline' - ish
« Reply #5 on: April 25, 2006, 07:40:00 PM »
We're all mad! Manganese is a fluoresence initiator and the colour of the light emitted seems to depend on what else is present. Uranium, however, fluoresces in its own right regardless of what else is present, hence always the same green, just varying intensity


Offline Leni

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More 'Vaseline' - ish
« Reply #6 on: April 25, 2006, 07:46:34 PM »
Right!  So it's likely to be Uranium, but just not so much in the mix  :?
Leni


Offline Lustrousstone

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« Reply #7 on: April 25, 2006, 08:01:44 PM »
No, I'm pretty sure its manganese. You don't need to be in the dark to see uranium glowing, but you do need it pretty dim for manganese glow. Will try for a pic :shock:


Offline Lustrousstone

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More 'Vaseline' - ish
« Reply #8 on: April 26, 2006, 06:40:58 AM »
Didn't manage a good enough pic, need to use the stronger UV light. But what you could do is try your UV light on some old non-uranium glass in the dark and see what colour glow that has, if any. Slightly sun purpled/greyish clear is a good bet for managese but a lot of pre 1950s coloured glass has the manganese glow. You should be able to see what I mean then.  :D


 

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