Topic: Green glass comemerative tankard George sixth, Davidson, Bagley. U.V reactive

[bungie60]

I believe this might be a Davidson piece but i stand to be corrected. It does have a glow under UV but not as strong as other pieces i have.So i am inclined to think it is due to added manganese which i believe was used to make green. But testing other green pieces they don't glow as well as this. It is a half pint mug any info out there would be appreciated thanks in anticipation Mark. More photos here
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-11001

[ChrisStewart]

Hi,
     It is not a Davidson piece. I think it is bySowerby.

Regards

Chris

[jsmeasell]

This mug is pictured in the book by Walker and Biss (p. 94 in the middle at the bottom of the page), but they do not indicate the colors in which it is known. My wife and I have the same mug in amber, and the round area containing the portraits is nicely frosted by acid etch.

[bungie60]

Thanks for that one and all just had a search and found this George V by Sowerby very similar. Why i did not think to put in sowerby before i will never know
http://www.belowstairs.co.uk/acatalog/Online_Catalogue_Commemorative_80.html

[Adam]

That colour looks like chromium, probably with some iron and maybe a little uranium.  Certainly no manganese, which gives violet or purple.

Adam D.

[bungie60]

That explains it then Adam compered with my other pieces of green, i can now see the difference. As i say you never stop learning and that now is another piece in the jigsaw.Thanks for your time

[krsilber]

That colour looks like chromium, probably with some iron and maybe a little uranium.  Certainly no manganese, which gives violet or purple.

Adam D.

Would it glow without the uranium?  Does chromium fluoresce?

I have actually seen formulas for greens that contained manganese in small amounts, presumably to counteract the color imparted by iron even though that's often a green as well (maybe the sand they were working with had a high enough iron content to turn it brownish, I don't know).  In any case, I doubt it would be enough to make a green piece fluoresce obviously.

[Adam]

Sorry, Kristi, I am no expert on fluorescence - there are contributors to this board who know far more than me.  In "my" day it was never an issue, perhaps because at that time there was no uranium available to buy.  OK, before someone reminds me, I did say that at Davidsons I inherited a small bag of uranium oxide.  It was still there when I left.  I never played with it for the simple reason that, no matter how wonderful the results we could never have made use of them commercially - no supplies.

Adam D.

[krsilber]

Makes a great story, anyway!  Not many people can say they've inherited a bag of uranium.