Abstract
The lightfastness of five basic triphenylmethane dyes in cotton and acrylic fibres is compared with their primary photochemical behaviour on flash photolysis in appropriate model solvents. The low lightfastness of the dyes in cotton is paralleled by the observation of strong transient absorption in propan-2-ol whereas their higher lightfastness in acrylic fibre is paralleled by a lack of transient absorption in acetonitrile. The transient species is attributed to the triphenylmethane radical formed by electron transfer. Further, the relative importance of photoreduction and triplet sensitisation in dye fading is also examined using benzhydrol as a hydrogen-atom donor and benzophenone as a triplet sensitiser.
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