jammy43 Posted February 12, 2014 Report Share Posted February 12, 2014 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 Link to comment Share on other sites More sharing options...
Norm Stuart Posted February 12, 2014 Report Share Posted February 12, 2014 I'd suggest reading "Mastering Cone 6 Glazes" regarding the need to test glazes for leeching. This spreadsheet has the Food Safe Clear Liner Glaze they use as an example. http://home.roadrunner.com/~nstuart/MC6G.xls Link to comment Share on other sites More sharing options...
Marcia Selsor Posted February 13, 2014 Report Share Posted February 13, 2014 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 Link to comment Share on other sites More sharing options...
neilestrick Posted February 13, 2014 Report Share Posted February 13, 2014 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. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted February 13, 2014 Report Share Posted February 13, 2014 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 Link to comment Share on other sites More sharing options...
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