"Mochaware invented in the 1790s, probably by accident, and much exploited for more than a century for utilitarian beer, mugs and jugs.  The technique consisted of dripping a special 'tea' composed of acidic tobacco juice, manganese and, by tradition, stale urine onto a surface freshly diped in coloured alkaline clay slip.  The reaction between the acid and alkali would spread the brown mixture into frond-like forms resembling the Mocha Stone from Arabia, which to a certain extent could be controlled by a skilled potter.  The lathe turned rims and feet were usually finished with simple trailed bands of slip." 

Source:  Pg. 226 English Pottery 1620-1840 by Robin Hildyard"


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