The effect of the SiO2 nanoparticles is more pronounced in silk
dyed with turmeric, indigo and cochineal because the colour coordinates
of these dyes are substantially different compared to the
corresponding valuesmeasuredfor SiO2, according to Table 2.However,
the colour components for SiO2 are relatively close to the
corresponding values reported for undyed silk and silk dyed with
weld (Table 2). Consequently, the effect of the SiO2 nanoparticles
on the colour appearance of these two samples is smaller.