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Bow Porcelain

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Bow Porcelain I


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Plate in underglaze blue, east London,c. 1742-43 or earlier. Bow soft-paste phosphatic porcelain of the Developmental period (ball clay 22 wt%, bone ash 33 wt%, lead glass 7 wt%, alkali glass 4 wt%, gypsum 8 wt%, crushed silica 26 wt%). Diameter 305 mm. (Taylor collection). The plate is thickly potted, heavy, and painted in bright blue with the Disconsolate fisherman pattern; see Amors (1997: No. 7). Compositionally this plate approximates the recipe specified in the Bow second patent of 1749 with 25 wt% crushed silica, 25 % ball clay and 50% virgin earth. In this case virgin earth comprises bone ash, glass cullet, both alkali and lead glass, and a distinct amount of gypsum (8 wt%). In some instances we have demonstrated that other members of the Developmental period had alum added rather than gypsum.
Posted on January 26, 2013



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