Fig. 3From: Colorful Hydrophobic Poly(Vinyl Butyral)/Cationic Dye Fibrous Membranes via a Colored Solution Electrospinning Process \( \overline{K/S} \) curves of prepared colorful NFMs doping with different cationic dyes before and after placement for 6 months corresponding to different colors: a red, b yellow, c blue, and d blackBack to article page