This flow tester proves the colorant is not fluxing or bubbling the glaze

Monday 24th June 2019

These cone 6 glazes are the same (G3806G), except the one on the right has 3.5% insight-live.com/material/236">copper carbonate added. Copper is commonly thought to flux glazes, making them melt more. But in this case it percentage is not high enough, the clear base is running just as much as the stained one. Another observation: I was suspicious that the micro-bubbles in the glass matrix were coming from the copper carbonate gassing during firing. But not so, as you can see, the flow on the left has them also, actually, it has even more.

Pages that reference this post in the Digitalfire Reference Library:

Copper Carbonate, Melt Fluidity, Making your own glazes

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