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Chrome dyeing using anionic bivalent chromium complexes as mordants
Author(s) -
Lewis D M,
Yan G.
Publication year - 1995
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1995.tb01677.x
Subject(s) - dyeing , chromium , chemistry , mordant , hexavalent chromium , wool , ligand (biochemistry) , bivalent (engine) , chromophore , polymer chemistry , organic chemistry , metal , materials science , biochemistry , receptor , composite material
Chrome dyeings are normally produced by first applying an acid dye containing ligand groups and then afterchroming with hexavalent chromium derivatives such as dichromate salts. The latter can damage wool fibres and also are toxic components in dyehouse effluents, so afterchroming with mixtures of Cr(III) salts and organic acids has been studied. It has been shown that the anionic complexes that form from trivalent chromium and the organic acids are fibre substantive at pH 2–4 and have the correct stability profile for exchanging ligands to bind the chromium with ligand groups in the dye. Dyeings produced generally show colour yields and fastness properties similar to the normal Cr(VI) dyeing process; the exception are these chromophores which undergo oxidative change in the dichromate process.