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Old 01-15-2018, 10:43 AM
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Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 21,110
Pete VanderLaan is on a distinguished road
Mark told me during the color classes that he had only used strontium in his glasses for the last 20 years with the exception of calcium monophosphate which is quite hard to find these days. He, like many , consider calcium to be a really trashy material. My glasses don't have much calcium if any these days. I do use Barium and zinc much more. If I have calcium, it's always in a 1/3 ratio with barium. I tend to use Sodium tri phosphate as opposed to tri sodium phosphate. I'm not much of a fan of sodium either.
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