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Raku - Low-fired Japanese lead-glazed earthenware. Raku is Japanese for 'enjoyment' and this type of pottery is traditionally used in Japan for the tea ceremony.

Reduction - Firing in a reducing atmosphere. This is when there is insufficient air for the flame to burn off its carbon content. The result is a smoky atmoshere that causes metallic content in the glaze and clay to change colour.

Refractory - Capable of withstanding very high temperatures. The kiln furniture has to be able to remain stable at temperatures in excess of the normal firing temperature an must be made of refractory materials.

Rib - A shaped tool to facilitate the forming of pots.