Abstract: Cyclovoltametric results showed that there exist chargetransfer complexes (CTC) consisted of cationic dyes, amino acids and molecular oxygen which possess more positive reduction potentials or higher peak currents than dyes. Irradiating the CTCS at their λ_max^CTC reveals that it is the amino acids of the silk that accelerate the light fading of the dyes.

Key words: cetionic dye, silk, amino acid, charge transfer complex, fading