Abstract: The interaction between oxygen and magenta azomethine dye was studied by laser flash kinetic spectrophotometry. It was found that the contact charge transfer complex was formed. The light fading of magenta azomethihe dye not only relates to the singlet oxygen, but also possibly to the free radical anion of oxygen. The effect of antioxidants on the excited state of magenta azomethine dye was observed and this verifies the former can quench the excited dye. The mechanism of inhibiting the light fading of magenta azomethine dye by the antioxidants was discussed.

Key words: Magenta azomethine dye, Antioxidants, Laser flash kinetic spectrophotometry, Light fading of dyes