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jammy43

Food Safe Glazes

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jammy43    2

I'm looking for the food safe guidlines for glazes.  I'm in the process of mixing up glazes from scratch and need to know what to lookout for.

Currently  i have a base that is:

EPK            30

Frit 3110     20

Gristle Boriate 50 

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Marcia Selsor    1,301

I agree. Mastering Cone 6 glazes is a great book for understanding glaze chemistry and understanding your glazes.

BTW I think you mean Gerstley Borate.

Marcia

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neilestrick    1,381

I assume this is a cone 6 glaze? If you put this glaze up against a limit formula, you'll see that it's quite low in silica, which can affect the food safety of the glaze. The only way to know for sure whether or not a glaze is food safe is to have it tested by a lab. However, with knowledge of glaze formulation you can formulate glazes that are likely to be food safe, which will save you a great deal of time and money before shipping tests off to the lab. Invest in a good glaze formulation book like Mastering Cone 6 Glazes as Marcia suggested above, or Clay and Glazes for the Potter by Rhodes, of Ceramic Spectrum by Hopper.

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JBaymore    1,432

Look around the "In The Studio" and "Technical" forum sections. This subject comes up a lot and there is a lot of good general information hiding in the threads already in place. Use the forum "search" function.

 

best,

 

........................john

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