Notes on Pottery Clays: The Distribution, Properties, Uses, and Analyses of Ball Clays, China Clays, and China Stone (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Notes on Pottery Clays: The Distribution, Properties, Uses, and Analyses of Ball Clays, China Clays, and China Stone

Clay generally contains various impurities, of which oxide of iron is the chief, and generally also its colouring ingredient. To the presence of this oxide is due the peculiar smell given out by impure clays when breathed upon or wetted, and which is called the argillaceous odour; although it has been, and may be, ascribed also to their being impregnated with vegetable matter: alumina and silica and pure clay being all alike free of it. Common clays have an earthy texture with a dull lustreless fracture, and are soft enough generally to take a mark from the finger nail. H. 10 to sp. Gr. 18 to Clays are never found crystallised; they are of various colours - brown, yellow, dull blue, green, red, grey, and white in the china clays.

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