Fig. 7 shows that the application of pure siloxane on silk
dyed with indigo caused a colour change (E* = 3.27 according to
Table 1) that is primarily attributed to the change of the brightness
component (L*). The application of pure siloxane had a similar
effect on the appearances of undyed silk and silk dyed with weld,
turmeric and cochineal, according to the results of Table 1.