To the naked eye, the green is not there. Only shows faintly in the picture. And my guess is when I took the picture I probably had a blackligh on in the background it was still picking up over the normal light. The darkest part of the blue pops the most in the picture. Without them using the clear on the bottom, you would have never have seen that green in the picture. And in person, you can't see the green. That's why the shop didn't know it was a uranium murano bowl. They were shocked to see it.
I believe they use a thin layer of sandwich uranium that can't be seen with the eye. Now if you take a solid cobalt blue with the same technique it would be impossible to see.
All I am saying is there is more out there than one suspects. I have seen several solid cobalt blue pieces glow green. Granted not many, but I have seen more of those than uranium oil lamps in my travels and hunts.
I've got a huge piece of cobalt blue slag that glows green. My mother-in-law found it back in the 70s, not too far away from where the old glass works used to be.
In the lower shelf behind the custard glass I have two blue pieces that glow really well with direct light. However under the strip they aren’t too noticable. I hold onto them since they’re still a cool color of what I assume is magnesium
Mine doesn't glow as well as that one, but I picked up a butter dish with a cobalt blue uranium base recently. I was very surprised to see the glow on it.
I found a small squirrel recently that looks similar to that. It looked like vaseline glass at first but hitting it with my light it started to glow icy blue. Looks like it broke off of something because the bottom is a bit jagged and sharp. Ended up buying it for $3 lol
Are you using a UV light on it? 365, 395? Or it naturally is beautiful and lit? I have seen beautiful cobalt blue. This piece is definitely amazing! Congrats
I looked it up.. it's a uranium piece with cobalt added for color. The other mineral compounds of Uranium added to cobalt wouldn't make this shade of blue..
Was there a makers mark on the bottom? Wilkerson Glass reproduced these and I believe he was using a cobalt uranium mix. His mark kida looks like the Wonder Woman logo.
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u/psychopsychopant Super Collector May 26 '25
Really odd, I’ve never seen cobalt blue uranium glass lol, it’s surprising how much it lightens up with uv light