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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.
Attribution:
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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Where are we going and why am I in this basket?
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