The Fastness to Light of Dyed Textiles

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Abstract
The significance is discussed of the light fastness of dyed textiles in trades intermediate between those in which it must be very high and those in which it is of little importance. The method of use of the S. D. C. standards is considered, and an account given of a series of exposures indicating various difficulties of assessment. The importance of exposing dyeings of binary and tertiary mixtures in addition to those of single dyes is stressed. It is shown that the same dye may have widely varying fastness on different fibres. The dyer's practical problem as to whether he is permitted to shade fast but dimoult–to–apply dyes with easy–levelling but less fast dyes is discussed with some examples connected with the dyeing of matt staple fibre for the carpet trade. In this connection a comparison is made with the dyes used on wool for the same trade. The use of fading lamps is discussed, and some practical results are given of a comparison made between exposures of the same dyeings (a) in a Droylsden Fadeometer and (b) to sunlight.

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