What is Raku ?
Raku (楽, raku-
It is primarily related to the manufacturing of bowls for the tea ceremony. The clay used is solid sandstone, because the objects have to resist to strong temperature variations.
Because the nature influences the result.
The technique of Raku provides objects which are unique, and almost impossible to duplicate. The final result depends not only on the raw materials used to create the object, as the clay and the natural components of the glazing, but it depends also largely on the way how the parts will be cooked, and then smoked and cooled down.
Different parameters influence the result: the cooking temperature of the glazed parts, the time spent inside and outside the oven before being smoked, the way the objects are cooled down, the type of flammable material used to smoke the objects, etc...
Smoking can be carried out at free air, or in a covered container. The hot parts are placed on a bed of sawdust, paper or hay. According to the type of wood used for the sawdust, the result will be different, because the proportion of potassium, carbon, calcium, etc... differ from one kind of wood to the other.