In summary, the results of Table 1 suggest that the use of siloxane
+1%w/w SiO2 for the protection of undyed and dyed silk is
appropriate and does not cause any colour change noticeable by
human eye. At the 2% w/w nanoparticle concentration, the coatings
correspond to higher E* (Table 2) but also to somewhat better
water and oil repellence, evidenced by the results of Fig. 3a and b.