Glass Identification - Post here for all ID requests > Glass
Do I not understand? Lead in glass a barrier to fluorescence of uranium opaline?
cagney:
Probably the best known lead/opal glass using uranium would be Mt. Washingtons/Webbs Burmese. For earlier examples see links below.
https://jeffreysevans.com/auction/diamond-point-sharp-diamond-omn-covered-egg-cup-pomade-24/
https://jefferysevans.com/auction/pressed-covered-basket-pomade-toothpick-holder-14/
https://jeffreysevans.com/auction/pressed-petal-columnar-pair-of-canlesticks-18/
https://jeffreysevans.com/auction/blown-molded-snake-entwined-cologne-bottle/
cagney:
Corrected links: https://jeffreysevans.com/auction/pressed-covered-basket-pomade-toothpick-holder-14/
https://jeffreysevans.com/auction/pressed-petal-and-columnar-pair-of-candlesticks-18/
flying free:
--- Quote from: flying free on April 05, 2023, 04:11:45 PM ---Thanks for taking those photographs Cagney. I've been mulling over that comment in PK. I think the fluorescence referred to must mean the yellow/green effect in seen in transparent uranium glass. And so not an effect seen in opaline glass by eye/daylight. So an explanation as to why that must have been the reason why there was no experimentation with French uranium opaline glass? There was nothing different about it so no need to experiment with using uranium in French opalines? Perhaps an explanation on how to differentiate French opalines from Bohemian opalines if there is a question over identification and the item contained uranium?
--- End quote ---
If I recall correctly there is the point that Baccarat was experimenting with opaline uranium glass. Perhaps this comment in PK is making reference to earlier times when French makers were doing their wonderful opalines and so during that period the point being made is there was no need/desire to include uranium in the batch.
flying free:
--- Quote from: cagney on May 28, 2023, 12:14:36 PM --- Corrected links: https://jeffreysevans.com/auction/pressed-covered-basket-pomade-toothpick-holder-14/
https://jeffreysevans.com/auction/pressed-petal-and-columnar-pair-of-candlesticks-18/
--- End quote ---
That's a gorgeous example. Lovely. Thank you.
cagney:
I would certainly concede there was no need to add lead to the batch to achieve the desired color. The PK comment seems to rely on the dichroic effect to achieve a goal in opal/uranium. Thus the somewhat negative attitude toward lead in the batch. What is the goal? More opacity? Lead glass seems to add a more translucent effect, due to greater refracture of light and lessening of the dichroic effect?
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