Fig. S2 (a) XRD profiles of glass slide as sample base (i) and various types of silk fabrics: library gauze silk (ii); commercial fine silk (iii); UV-aged fine silk (iv); starch-coated fine silk (v) and UV-aged starch-coated fine silk (vi); (b) Overlay of the three curves (ii), (iii) and (iv) in the grey rectangle from (a)