Mayco Raku glazes are designed to develop beautiful metallic lusters and crackle patterns when fired according to raku firing processes. Raku glazes will not produce the same results in a typical electric firing – must encounter a raku environment. Due to the unpredictable nature of this firing technique, results will vary with every firing.

General Use:

Shake for 5-6 seconds before use. Stir well. Apply 2-3 coats to bisqueware, 2 coats for RK106 and RK107. Use of a thermal shock-resistant raku clay body will help reduce the incidence of cracking. Do not glaze inside or bottom of the ware. Thinner coats tend to produce greater metallic effects. You can adjust your glaze application if you are not getting the desired metallic results. Allow to dry thoroughly. Fire to cone 06 (1850°F, 1010°C) and hold for 5 minutes. Remove ware from kiln with tongs. If using an electric kiln make sure the power is off, and allow to cool. Minimizing the distance between the kiln and the reduction container can improve the development of metallic colors. Place ware into metal lidded container with combustible materials. Place lid on immediately to reduce oxygen. The combustible materials will produce flames and smoke. Leave in the container until cool, approximately 20 minutes and remove. After ware has completely cooled use water and a scouring pad to clean; cleaning will improve the luster and colors in the fired finish. Actual fired results will vary according to choice of clay.

Health and Safety:

Raku glazes are CL (Health Caution) with the exception of RK-103 White Crackle, which is AP Non-Toxic. Raku glazes are not recommended for dinnerware due to the durability of the fired glaze. Some glazes, regardless of surface texture or porosity of underlying clay body, will be designated as not suitable for dinnerware as the fired glaze surface is not durable and can be impacted by contact with food or liquids. While it may not be harmful, it is certainly not desirable. Recommended for ornamental use only.