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I am getting ready to try making some phosphate opals and in going back to this thread I found it to be so useful as to be worth bringing back to the front. I will eventually move it to Antiques and Classics.
I have acquired sodium tripolyphosphate from Univar in Providence which was kind of pricey at $1.80 lb. If dave is reading this I was wondering how carefully you screened, or crushed the stuff? Chunkyness has always been a big issue with these glasses. I am by the way finding that a small coffee grinder is a fabulous way to crush small quantities of chemicals.
It makes the coffee taste funny though.
Rich, in looking at the formula you originally used for this thead, . What L.E.C. were you aiming at with that glass? Was it an SP compatible?
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