Raku fired slab platter with multicolored metalic and crackle white glazes. 

Raku is a firing process that originated with the Japanese tea ceremony. Ware is quickly brought to a  temperature  range of approximately 1800 degrees F, and  is immediately placed in a container of combustable material such as paper, sawdust or straw. The container is sealed after it ignites to reduce oxygen. The metalic compounds in the glaze create dramatic, unpredictable results in this "reduction" atmosphere. Often the surface  becomes "crazed" or develops a crackle pattern . Unglazed areas become blackened from carbon.