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Difference between stains and onglaze powders


vivk

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Hi all 

I would so appreciate it if anyone could give me a fairly scientific explanation of the difference between stains used in glazes and stains used in Overglazes. Are the overglazes more refined pigments - or calcined to a higher degree than the glaze stains. It may seem like a fundamental question to seasoned potters but I have been unable to find a good explanation. Even digital fire does not really explain it properly or at least in a way I can understand it from my varsity chemistry days. 

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Stains are basically the same in glazes and overglazes. Differences would be in how some stain formulations interact with some glaze/overglaze components. The website for Mason Stains gives charts of compatibility. All are mixed in, small amounts at a time, till the color is dark enough for you. This is where your individual  testing  comes in, depending on what you're looking for. They don't mix together to create other colors like paint.

Nor sure what you mean by "onglaze powders."

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