Calvert, F. (Frederick) Crace', 1819-1873, Stenhouse, John, Groves, Charles Edward, 1841-1920 · Manchester : Palmer & Howe · leaf 376
CATECHU BROWN (LIGHT SHADE). 338 DYEIXG AXD CALICO PRIXTIXG. … CATECHU BROWN (DARK SHADE). salammoniac are added to the thickened decoction beforeprinting, the goods being subsequently steamed and passedthrough a bichromate bath. The copper salts andbichromate of potash completely oxidise the catechin intojaponic acid, giving thus the rich catechu browns so…
Dyes and dyeing · Calico-printing
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