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The photochemistry of the cationic dyes safranine (3,7-diamino-2,8-dimethyl-5-phenylphenazinium chloride, SF+) and phenosafranine (3,7-diamino-5-phenylphenazinium chloride, PS+) has received considerable attention because of the photoredox properties of the dyes. In particular SF+ was investigated for applications in some areas of research such as, analytical, biological, solar energy and initiation of photopolymerization. The related dye PS+ has been extensively employed as a sensitizer in energy and electron transfer reactions in homogeneous media and in semiconductors and polymeric media. The dye was also employed as a probe in reverse micellar systems and its photostability in polymer-coated semiconductors was investigated.