Ceramic clays are water-based substances made from clay minerals mixed with other raw materials. They are baked at high temperatures, in a process known as firing to create ceramics, such as terra cotta, earthenware, stoneware, and porcelain. Paper clay produced by pottery clay manufacturers is any of these clay bodies, to which a small percentage of processed cellulose fiber has been added. When kiln fired, the paper burns out, leaving the clay body. Consequently the firing temperatures and glazes selection should be the same on those used with the clay body.

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