LinR Posted May 4, 2018 Report Share Posted May 4, 2018 I'm going to have pots in a once/year wood firing. Ben Bates Oribe Green Cone 9-13 was given in a CM this past year and looks very interesting but I am wondering with 6% Copper carbonate if it would be food safe fired between cone 10 - 12? recipe is: Bone ash 2% Talc 9% Whiting 23% Custer feldspar 31% EPK 11% Silica 24% add: Copper Carb 6% Thanks for any help you can offer. Link to comment Share on other sites More sharing options...
Min Posted May 5, 2018 Report Share Posted May 5, 2018 Lots of debate on this forum as to whether or not copper leaching is an issue or not. Here is one of the discussions that is worth reading. To make a stable glaze there are "limits" for the necessary amounts of silica and alumina (and other oxides) for glazes. If you fall far below the limits for silica and alumina the other oxides in your glaze are more prone to leaching out of the glaze. Have a look at column one in the chart below, it is the formula for your glaze (without the copper), now have a look at the last column, it is the "target limits" from Green & Cooper for a cone 10 glaze. Link to comment Share on other sites More sharing options...
LinR Posted May 5, 2018 Author Report Share Posted May 5, 2018 Thanks Min. This gives me an idea of what to look for. Lin Link to comment Share on other sites More sharing options...
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