Lynnupnorth Posted March 30, 2013 Report Share Posted March 30, 2013 Hi, I am hoping someone can help me understand how to make sure glazes I make from recipes are non-toxic. I won't be using any lead, but obviously other oxides are toxic, and I read warnings about them but no advice on how to make sure the finished piece is food safe. I'm getting back into pottery after several years idle (no kiln access), and all my prior experience was in classroom situations where the instructors prepared the glazes and suggested which to use. I'm also hoping to create dinnerware that will withstand normal use without knives marking the finish. I'll be firing in a Paragon Touch n Go, trying to keep it to cone 6 to keep the kiln lasting a while. I've read that there are tests, but what are they? I have lots of questions, actually. One more question - I remember that cobalt oxide needed to have an overglaze to turn blue - is there any specific clear glaze, or would any one do it? Thanks so much. I've been reading like crazy, but I can't find all my notebooks, and it's maddening to remember bits and pieces and not have my instructor there to ask! Link to comment Share on other sites More sharing options...
bciskepottery Posted March 30, 2013 Report Share Posted March 30, 2013 I'd suggest picking up a copy of John Hesselberth and Ron Roys "Mastering Cone 6 Glazes". The provide a good discussion on making safe, durable glazes and a wealth of glaze recipes -- base glazes and glazes with colorants/clears -- for you to choose from. Best, they have labortory tested the glazes for durability and safety . . . so that gives you a head start. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted March 30, 2013 Report Share Posted March 30, 2013 As long as you use balanced recipes and fire them correctly, things should be OK. Underfiring or unbalanced recipes can leach. I agree to read up on this. Mastering Cone 6 Glazes is an excellent place to start. Marcia Link to comment Share on other sites More sharing options...
Guest JBaymore Posted March 31, 2013 Report Share Posted March 31, 2013 Lots of other threads here and in the "In the Studio" section. Look for related thread titles. best, ..............john Link to comment Share on other sites More sharing options...
Lynnupnorth Posted April 2, 2013 Author Report Share Posted April 2, 2013 Thanks to all of you for responding. I will look for that book. I also have been reading a variety of other books, including Woody, Rhodes, Zamek, Britt, and Murfitt. Zamek does give specific info on glaze and clay body testing. Just wanted to check with the minds here. Thanks again! Link to comment Share on other sites More sharing options...
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