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Old 04-29-2020, 08:35 AM
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Pete VanderLaan Pete VanderLaan is offline
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1 part cobalt in 10,000 shows distinct color. It's the mixing it in evenly that's hard. In batch, it's not quite as hard. You can make powder blue which takes one part cobalt and mix it with one hundred parts batch. Then take one part of that and mix it with one hundred parts batch. That mix will allow you to measure out reasonably repeatable portions. If you don't do it in batch, use finely fritted or crushed cullet. It still needs to be mixed, or if not mixed, then pressure air mixed as melted in the pot which is a risky thing to do.

Gram scales are really helpful as Josh notes.

Cobalt carbonate is an easier way to put the cobalt in since gram for gram, there's not as much cobalt.
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