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Old 02-07-2020, 03:36 PM
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Study of bone ash

Not all bone ashes are created equal.

Someone is doing a study to determine if the bone ash obtained from grass-fed cows makes a better porcelain. Apparently, it does.

https://www.fastcompany.com/90460845...aGosC0_LUcKaKg
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Old 02-08-2020, 07:00 PM
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Bone ash has always been flakey. The bone ash we all loved in 1970 was called bone ash 21, a rather greasy material that indeed did make a beautiful opal if you could get the mess hot enough to not cause stones. Once it was gone it was gone and Calcium polyphosphates were the only thing available. They never worked for me once.

Mark Peiser has persisted in finding calcium monophosphate but good luck locating it. If one uses strontium as a substitute for calcium as much as possible, it certainly performs better and strikes best on re annealing.

As to the "whole Cow" being used. I'm sure it's thrilled.
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Old 02-10-2020, 05:43 PM
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Well shit. I canít call my glass vegan if I use bone ash.
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Old 02-10-2020, 06:25 PM
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just use the synthetic.
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Old 02-10-2020, 06:31 PM
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Batch composition seems to me to be the biggest factor when using a similar phosphate sources. When using STPP in Dave's formula I get a "long" striking result. So gorgeous and beautiful in big solid sections like the old Daum and Lalique stuff. Terrible for goblets. STPP added to Spruce Pine gives a lovely quick striking glass that is great for cups. They are pretty different formulas.
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