Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40494-021-00493-5/MediaObjects/40494_2021_493_Fig4_HTML.png)
ISO lightfastness ratings in the third edition of the Colour Index [22], for colourants listed in the first edition [16]. Data selected for normal depth of shade, and direct dyeing without aftertreatment where applicable. ISO values for mordant dyes primarily relate to wool with chrome mordant. A small number of duplicates with the same CI generic name was removed for this plot