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Old 12-20-2018, 12:33 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
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Pete VanderLaan is on a distinguished road
I would be very surprised to find that was not a generic phosphate opal actually.

I have a large piece of Mark Peiser's in our bedroom and its a monolithic casting six inches thick by about 30 inches of a Phosphate glass, which is all Mark works with. During the day it changes from translucent white to yellow to blue and then to red.

The thing that was driven into me over the years was how important the modifiers and stabilizers are in a base glass. They totally determine the color with few exceptions. Calcium is not your friend when making color. Neither is sodium.
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