The peroxide bleaching of aqueous phenolphthalein, alizarin and crocetin in alkaline solution is not caused by free radical species, nor by singlet oxygen, but by hydrogen peroxide and the perhydroxyl anion, HOO–.
K. M. Thompson, W. P. Griffith and M. Spiro, J. Chem. Soc., Chem. Commun., 1992, 1600 DOI: 10.1039/C39920001600
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