Fig. 2From: Colorful Hydrophobic Poly(Vinyl Butyral)/Cationic Dye Fibrous Membranes via a Colored Solution Electrospinning ProcessImages (a–e) are the prepared PVB/dyes colorful NFMs on aluminum foil substrates, where a is the pure PVB NFM, b PVB/X-GRL NFM, c PVB/X-10GFF NFM, d PVB/X-GB NFM, and e PVB/X-2RL NFM. The absorption spectra of these electrospun stained NFM (f) is also measured, where the inset color bar shows the color of visible light wavelengths within 380–700 nmBack to article page