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Glazes Though all redware begins with clay dug from the ground, the glazing and firing process creates drastically different results. After firing, unglazed redware is pale red in color, easily observed on unglazed surfaces, like the outside of this 19th century pot. Most pieces, however, were colored by applying glazes and clay slips made before firing. Common Glazes Metal Oxides Iron Salts = Brown Copper Oxide = Green Manganese = Purple and Black Clays Pipe Clay = Pale Yellow Albany Slip = Mottled Black and Brown Mineral Lead = Clear Cobalt = Blue A cake mold decorated with copper oxide and pipe clay A bean crock decorated with Albany slip A colorful pitcher decorated using pipe clay, copper oxide, and cobalt A jar decorated with lead and manganese A cake mold decorated with pipe clay and Albany slip