Ceramic colorants are added to a glaze or a clay to create color. Carbonates and oxides of certain metals, characterize most colorants including the commonly used cobalt oxide, chrome oxide, copper oxide, copper carbonate, nickel oxide, titanium dioxide(rutile & anatase), Zinc Oxide and tin Oxide . These colorants can create a multitude of colors depending on other materials. they interact with and to which temperature and in which atmosphere they are fired.