Low-fire ceramics firing technique where the flames create unpredictable coloring and patterning on the clay body by reacting with both the clay and its glaze; completed by either dipping the still-hot pieces into water (does not break because the clay usually contains high amounts of grog and has a high-fire clay body), or "reducing" the pieces with smoke to create an unpredictable blackening of the body.

Technically speaking, what is often referred to as Raku is actually a technique called American flash firing, a technique pioneered by Paul Soldner in the 60's.

Real Raku is any earthenware produced by the Raku family in Japan.