RK103 White Crackle (Mayco)

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RK103 White Crackle

White Crackle develops a fine crackle pattern over a white gloss surface following a proper Raku Firing. Due to the unpredictable nature of this firing technique, results will vary with every firing.


Mayco Raku glazes are designed to develop beautiful metallic lusters and crackle patterns when fired according to raku firing processes.


Glazes designed for the mysterious raku process using combustibles and varying firing methods to produce unique finishes. There are several methods and many nuances to raku firing – for our purposes here we define raku firing broadly as the processes of firing an earthenware body and glaze in a kiln, removing the ware from the kiln after it has reached proper temperature, placing it in a container of combustible material and enclosing the container to reduce the oxygen in the container.


Shake for 5-6 seconds before use. Stir well. Apply 3 coats to bisqueware. Use of a thermal shock-resistant raku clay body will help reduce the incidence of cracking. Do not glaze inside or bottom of ware. Thinner coats tend to produce greater metallic effects. If you are not getting the desired metallic results you can adjust your glaze application. 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 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 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.

Not Dinnerware Safe
Raku glazes are not recommended for dinnerware due to the durability of the fired glazeSome 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 liquidsWhile it may not be harmful, it is certainly not desirableRecommended for ornamental use only.

Firing Range:
Low Raku
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