Palm's Cobalt Oxides are the principle source of CoO used in glazes, glass and enamels. Cobalt Oxide is a coloring oxide that produces blue in glazes at all temperatures. Cobalt Oxides are ideal for enamel frit applications. Frit is a homogenous melted mixture of inorganic materials that is used in enameling iron and steel and in glazing porcelain and pottery. Frit renders soluble and hazardous compounds inert by combining them with silica and other oxides.