From LouisKatz

Soluble: IronCompounds

Because Copperas reacts with air I have been considering a full change to Iron Chloride (Ferric). I have some hesitancy because of its corrosive nature and it now occurs to me because of the chlorine. In a gas kiln there is ample H2O for reaction it seems, but I wonder about what happens in an electric with lots of chlorine. It seems like a potential hazard that I do not have a big enough understanding of. I am not very concerned about one or two pots, but a kiln full might be a problem. Copperas when fresh and allowing the solids to settle makes a wonderful colorant on American shinos. The Iron chloride reacts with sodium carbonate. Although different, my limited testing makes me think that I will enjoy this to. Iron Chloride also appears to react with calcium carbonate. When put over a calcium carbonate glaze it appears to not work like soluble colorants and move towards edges but distribute itself through the glaze. On raw clay the chloride seems to spread out nice. So far I have not seen it favor edges much, it seems to deposit evenly. I am searching for something that would work better

I also have been wondering about using waste Ferric Chloride solution from printmaking. It probably has lots of copper chloride in it. Anything that keeps the copper chloride out of the waste water is probably good. Ferric Chloride solution can be treated with sodium carbonate to drop the copper chloride out of solution as carbonate (I think).

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