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Unlike the porous earthenware, porcelain vessels are in the wholly vitrified, have a white color, sometimes translucent, and they have a fine-grained liquid-proof body.
Purple clay (Zisha) is a generic term for the clay material found indigenous to the region of Yixing, China. Purple clay is in fact midway between earthenware and porcelain.
Yixing, Jiangsu Province, known in China as the "Pottery Metropolis", produces a much-valued red and boccaro ware. Teapots of this category made there were appraised as the best vessel there was, already in the Song Dynasty a thousand years ago.
Chinese cloisonné was strictly of the enameled variety (the other, and original, variety used small, worked precious stone pieces that were held in place by the soldered metal strip that was snuggled around the stone's base
