Pieces made out Rakú technique.  Raku is a ceramic technique born in Japan, although there are also theories that it arose in Korea, with which ceramics were made for the tea ceremony.
The particularity of this process is the reduction, in which the piece is removed from the oven at a temperature between 750º-980º Celsius, then the piece on flammable material, to make smoke and it is covered very well so that oxygen does not enter. This produces a reaction in oxides, such as copper, iron, tin, etc. giving it a unique appearance in its colors and dyeing the clay black.

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