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These are actually two different cone 6 base glazes to which I add a black stain (4 and 5%), G2934 and G2934Y. I trust them because I formulated and perfected them myself. Stains are inherently much safer to use than raw metal oxide colorants because they are sintered as colorant/stabilizer blends. And much less is needed (15% of blends of nickel, cobalt, iron and manganese are traditionally used).
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