Fort Pottery Company - clays, pottery supplies, and equipment

Over 1500 quality clay and ceramic products for hobbyists, teachers, and potters.

Amaco "O" Glazes

Cone 05. Although AMACO® Opalescent Glazes may be used on any clay, they develop their greatest opalescence and most interesting textures when applied over red burning clay.

Most of the AMACO® Opalescent Glazes have a high gloss with an iridescence similar to mother-of-pearl. Best results are achieved with three or four applications of glaze. On textured ware, the glaze flows thin on relief and thick in incised areas, giving an added dimension on the surface.

AMACO® Opalescent Glazes can be used very effectively in Raku firing. We suggest controlled experimentation with Opalescent glazes (for example O-42, O-23 at Cone 5 (2205°F, 1207°C). When fired at this temperature on the inside of a stoneware bowl, the glaze flows to produce a variegated bottom and thins at the rim to expose more of the clay body.

AMACO® Opalescent Glazes are supplied in liquid, ready-to-use form in pint jars. They are applied on a mature Cone 04 (1971°F, 1077°C) bisque by brushing, dipping or pouring. On red bisque, these glazes should be applied rather heavily, and a slow rather than fast firing is best. Firing range is from Cone 05 (1911°F, 1044°C;) to Cone 03 (2019°F, 1104°C). Recommended firing temperature is Cone 05 (1911°F, 1044°C).

Glaze Safety Information

Products bearing the AP Approved product seal of the Art and Creative Materials Institute, Inc. contain no materials in sufficient quantities to be toxic or injurious to humans or to cause acute or chronic health problems. They may be used with complete confidence by persons of all ages including young students (K-6) and handicapped adults.

Products bearing the CL Health Label (Cautions Required) seal of the Art and Creative Materials Institute, Inc. are certified to be properly labeled according to the chronic hazard labeling standard, ASTM D-4236 and the U.S. Labeling of Hazardous Art Materials. These glazes and underglazes should be used only by persons who can read and follow suggested label precautions for safe use.