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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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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