The technique used in making Raku pottery originated in 16th century Japan. Decorated with low-fire glazes, the pieces are quickly heated to red hot temperature in a gas kiln. The vessels are then quickly removed from the kiln and placed into a canister of combustibles such as dried leaves, wood shavings or paper. This material catches on fire causing variations in the glazes on the vessels. Due to the firing technique, Raku pottery is for decorative use only.