Photochemical demethylation reactions in solutions of thiazine dyes, in which the dye molecules act as both sensitizer and substrate, are reduced by quenching triple-state dye molecules, returning them to the unreactive ground state.
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US Patent 07462346 Light-stabilized(in vivo) stain composition and method of manufactureUS Patent 7462346 Light-stabilized(in vivo) stain composition and method of manufacture