The methods of Part I, which combined electron microscopical examination of dyed ultrathin viscose films with lightfastness measurements on corresponding rayon dyeings, were extended to several direct dyes of diverse chemical structure.
Only two of the nine dyes studied did not appear to aggregate, i.e., did not form aggregates detectable in the dyed viscose films at a resolution limit of about 30 A. The apparently unaggregated dyes exhibited considerably poorer lightfastness on rayon than the others which aggregated in viscose.
The results support the idea that the physical state of direct dyes in viscose is an important factor in determining their lightfastness on this material.
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