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Old 01-14-2018, 06:48 PM
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Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 21,105
Pete VanderLaan is on a distinguished road
Robert Held NECCA confernence 1968 ( pre GAS) . At that presentation Robert Asserted you could Add Up to 5% Phosphate using bone ash 21 ( don't even try) to the base clear BATCH glass without experiencing issues on mismatch.
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That' s Robert Held, so you're clear. ( Alive and involved)

I tried it and it worked. The Strontium is indeed a big step ahead, Thanks Dave, Thanks Milos (R.I.P.) . It works too. Fire opals by their vary nature always have the blue / red transmission characteristics.
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