Amaco F-Series glazes are fritted, leadless compositions. The semi-opaque colors are more intense and brilliant than those of many other glazes and fire with a high gloss. Because they are leadless, they are recommended for pottery dishes such as cups, plates and bowls as well all types of pottery made from Amaco pottery clays. Recommended firing temperature of Cone 05 (1911 degrees F, 1044 degrees C). Glaze must be applied on a mature Cone 04 (1971 degrees F, 1077 degrees C) bisque by brushing, dipping or pouring. Contains no lead or cadmium. Food safe when fired to recommended temperatures. Pint jar. Jet Black. AP Seal, non-toxic.