Raku Vase - Green & White CrackleRaku is a process that dates back to 1573 A.D. in Japan. The process involves glazing bisque fired pieces using glazes containing high amounts of copper and other metallic salts. The pots are then fired to 1800 degrees F in a gas fired kiln. Upon reaching the maturity temperature of the glaze, the kiln is opened and the red hot vessels are removed using tongs for handling. The containers contain organic material such as paper, sawdust, leaves or dried grass clippings. This produces a reduction atmosphere in which the pots remain until partially cooled. Upon removal from the reduction containers, the pots are sprayed with cold water to further cool them. This process produces pottery that has beautiful metallic finishes that range from reds, greens, blues and shades of yellow. A great deal of variation can be produced by using various glazes and reduction materials.
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