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supertartrate
supertartrate n. 
/ˌsjuːpəˈtɑːtreɪt/,
Brit. /ˌsuːpəˈtɑːtreɪt/
, /ˌsuːpəˈtɑːtreɪt//ˌsjuːpəˈtɑːtreɪt/U.S. /ˌsupərˈtɑrˌtreɪt/
/ˌsupərˈtɑrˌtreɪt/ΚΠ
1804 A. Duncan Edinb. New Dispensatory (ed. 2) ii. 71 The white flux..is prepared by deflagrating together equal parts of nitrate of potass and super-tartrate of potass.
1843 Penny Cycl. XXVII. 458/2 Malate of lime and super-tartrate of lime [in the juice of the grape].
1891 Hardwicke's Sci.-gossip 27 32 The colour is fixed by a mordant of alumina and oxide of tin, and the colour is intensified by super-tartrate of potash.
2007 A. Broomfield Food & Cooking Victorian Eng. vi. 117 Crooked vintners lined their port bottles with supertartrate of potash to make the product appear like an expensive crusted port.
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