LIGHT-INDUCED COLOUR CHANGES OF NATURAL DYES

Abstract

Samples of wool dyed with a range of nine dyes have been exposed in a Microscal fading lamp. The colour changes accompanying light fading have been followed visually and instrumentally, and characterized in terms of light fastness grades, grey scale differences, colour differences in CIELAB colour space and in Munsell colour co-ordinates. The light fastness grades are similar to those previously reported for daylight exposures. The various methods of expressing colour change give detailed and quantitative measures of the effects of light on the colour of natural dyes; this type of information could be of value in predicting the original colour of ancient textiles.

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