Topic: Thick-walled golden amber rectangular vase ID=Klaus Breit, Wiesenthalhütte

[rocco]

Sorry to bump this, but I am really interested in what you think about my "German Uranium sommerso vase"

Am I right that the inner layer is Uranium glass? I guessed so because of the strong green glow in sunlight. Or would a Manganese glow be visible in daylight, too?
And would the thick amber layer explain why the glow isn't visible at the sides of the vase, just at the rim, and why Dirk couldn't see it? (Depending on the design of the rim in his vase).

Anyway, it is an absolutely stunning technique...
Astrid, is this mentioned in the Wiesenthalhütte book?

Thanks,
Michael

[Cathy B]

Michael, see if you can position the light to shine into it, and see whether the inner surface glows. From your description it shouldn't because if that inner layer were uranium you'd expect the glow to show through the amber layer, but it would help settle the issue one way or the other.

[rocco]

Thank you very much for your contribution, Cathy!
I was thinking Uranium because the (glowing) green inner layer is only obvious in bright daylight. So you think this may just be green coloured glass without Uranium content?

I will try to test the vase at work next week -- if it doesn't glow bright under the blacklights there (two batteries of 6 UV fluorescents each ), it is certainly not Uranium...

Michael

[rocco]

Tested at work today; now it's official -- no green glow even under several strong UV fluorescents. Only the orange glow Dirk observed in his vase.

I promise I will not test for Uranium at home any more until I have a better blacklight!
 
Still a fascinating use of colours with the thick amber around the bright green (non Uranium :usd:) layer.
And quite elaborate --  maybe that is why the use of "spectral gelb" was omitted so soon?

Michael

[dirk.]

Sorry for not coming back earlier! Been a bit busy for the last days...
I´ve just checked my vase again and it seems to consist of three layers. The middle layer shows a strong
cadmium glow while the others don´t. I remember a similar reaction on this Gralglas piece:
https://picasaweb.google.com/108140812446658939096/Gralglas#5588847697145821618
Wether it´s just a question of the colour effect or technical reasons as well (the glassblower taking more
glass after blowing the first little bubble) is beyond my knowledge I´m afraid.  :huh:

[rocco]

Thank you very much for looking once more, Dirk!
My vase has definately 2 layers (I think the thin bright-green layer is quite clearly visible in my close-up pics).

Still nice that Wiesenthalhütte put so much effort in a single-coloured block vase

Michael