65288a64fe Many are azo dyes, although anthraquinone and triphenylmethane compounds are used for colors such as green and blue. In contrast to dyes, pigments are insoluble and have no affinity for the substrate. Online corrected version: (2009) "azo compounds". The dye is generally applied in an aqueous solution, and may require a mordant to improve the fastness of the dye on the fiber.. Most synthetic food colors fall in this category. Clarke; W. For instance a mixture of styrene and maleic anhydride in toluene will react if heated, forming the copolymer upon addition of AIBN. Synthetic.
(1992). Most DVD-R/+R and some CD-R discs use blue azo dye as the recording layer. Mordant dyes require a mordant, which improves the fastness of the dye against water, light and perspiration. A number of other classes have also been established, including:. For other uses, see Dye (disambiguation). The color of denim is due to indigo, the original vat dye. Synth.; Coll.