Frits

Frits are combined raw materials that are mixed, fired, melted, crushed and ground into a powder. The reason for fritting is to render soluble materials insoluble; decrease toxicity of raw materials such as lead, barium and zinc; to reduce fusion point of glazes; and to avoid volatilization of unstable substances. Frits are often used in glazes as fluxing agents but can also be used in slips and clay bodies.