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Colors in glazes are affected by the clay, slips, stains, or underglazes below them. Most ceramic colors, however, are a result of metallic oxides being dispersed in the fabric of the glaze itself. Under varying circumstances, these colorants can give very different results.The Three Main Factors Affecting Pottery Glaze Color There are various factors that can impact a glazing color. These mainly fall within a group of three major factors.-The composition of the glaze. This not only includes the colorants in the glaze, but also other glaze materials that interact and effect that colorant or combination of colorants.-The temperature to which the glaze is fired. Some colorants are volatile and will dissipate into the kiln atmosphere if fired too high. Others give different colors at different temperatures.-The kiln's atmosphere during firing and, in some cases, during cooling.read more and lean the Absolutely guide to glaze colorants and raku pottery.