BRILLIANCY OF SHADE
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Reactive dyes can be seen to consist of two parts –– the chromophore and reactive system. No constraint is placed on the chromophore other than that it should contain a group capable of attachment to the reactive system. Thus any type of chromophore can be used to prepare a reactive dye, making it possible to get almost complete rainbow of shades. Groups most commonly used as chromophores are azo , anthraquinone and phthalocyanines, all containing a number of sulphonic acid groups to impart high solubility in water. Since it is no longer necessary to incorporate into chromophore structural features to encourage aggregation, chemically very simple chromophores can be chosen resulting in clear, bright and attractive shades.
Reactive dyes thus combine the advantage of bright shades of almost unlimited range. Present day fashion trends for very bright hues has been possible only due to this unique feature of reactive dyes.
