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How can somebody referer to porcelain as "Mud pie" when it actually is?
Porcelain is a ceramic material made by heating raw materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 °C (2,192 °F) and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures .
Porcelain derives its present name from its resemblance to the cowry, which in old Italian was called porcella, meaning little pig. [1] Properties associated with porcelain include low permeability and elasticity; considerable strength, hardness, glassiness, brittleness, whiteness, translucence, and resonance; and a high resistance to chemical attack and thermal shock.
I am shocked.
Very enlightening.
Did you ever throw (shape) any porcelain on a potter's wheel?
Potters sometimes say things like that about porcelain because, despite its other charming attributes, it doesn't have particularly good working properties. This is due to the relatively large grain size of the kaolin. Finer grained clays, usually referred to as ball clays, which would impart better working characteristics must be kept to a minimum to retain the whiteness of the fired product.
Personally, I love the feel of porcelain clay and simply adapt my throwing technique to deal with the floppiness of the clay. Often that means partially forming a piece and then allowing it to dry and stiffen up a bit before continuing to refine the form. Too fussy for many potters, especially production potters.
Italian Ceramic Making Spinning wheel #3
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