Excerpt from Art and History of the Potting Business: Compiled From the Most Practical Sources, for the Especial Use of Working Potters In the manufacture of blue, likewise, much economy has, of late, been displayed. The process now in active operation, at Birmingham, has greatly cheapened the use of Cobalt. It is also thought, that a still further reduction will speedily take place. Field, in'one of. His recent works entitled Chromatics, directs the atten tion of colour-makers to what he terms blue ochre; a mineral, like most other ochres, to be met with in the west of England. For durability of teint, in oil paint ing especially, he states it to be second not even to Ultra-marine, or the blue of the Lapis Lazuli. It is in little use, and consequently 111 little demand; but might prove of the greatest importance to the practical potter. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books.

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