Titlebook: Colour Chemistry; R. L. M. Allen Book 1971 R. L. M. Allen 1971 chemistry.development.information

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Colour and constitution,e was not established until many years later. As more and more dyes were discovered and their chemistry was studied, working rules emerged whereby colour and dyeing properties could be related with structure. Some of the more important contributions to the development of the subject are now briefly

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The chemistry of azo dyes,st one is usually an aromatic nucleus. Many methods are available for preparing azo compounds, but manufacture of azo dyes is always based on the coupling of diazonium compounds with phenols, naphthols, arylamines, pyrazolones or other suitable components to give hydroxyazo or aminoazo compounds or

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Technical azo dyes for cellulosic fibres,es of plants of the . family, especially .. After removal of glutinous and pectinous matter the fibre has a cellulose content of 82–83%. Cotton, which is fine hair attached to seeds of various species of plants of the . genus, has a cellulose content which may reach 96%.

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Azoic dyes, upon cotton fibre. They impregnated cotton with an alkaline solution of .-naphthol, then treated it with a diazo solution obtained from aniline, a toluidine, xylidine, naphthylamine, aminoazobenzene or aminoazotoluene, so that particles of an azo pigment were formed and became firmly fixed within t