Fig. 2
From: The effect of prior exposure on the lightfastness of early synthetic dyes on textiles
Comparison of methods for interpreting the fading of Hofmann’s Violet RRR: a Relationship between ΔE00 unity steps and ΔE00 from the fading curve (referenced to the original colour); b Comparison of methods for evaluating the future dose causing a JND as a function of prior exposure
