Raku ware (楽焼, raku-yaki?) is a type of Japanese pottery that is traditionally used in the Japanese tea ceremony, most often in the form of tea bowls. It is traditionally characterised by being hand shaped rather than thrown; fairly porous vessels, which result from low firing temperatures; lead glazes; and the removal of pieces from the kiln while still glowing hot. In the traditional Japanese process, the fired raku piece is removed from the hot kiln and is allowed to cool in the open air or in a container filled with combustible material. Raku techniques have been modified by contemporary potters worldwide.
Read more about Raku Ware: History, In Literature, Oxidation Reduction, Reduction Firing 2, Western Raku Techniques, Kilns and Firing, Design Considerations