“…A more accessible solution is the use of organic dyes, which have a simpler synthesis pathway, are less toxic and exhibit improved stability and solubility. 33 Some dyes, such as acridine orange, 34 erythrosin B, 35 eosin B, 36 rhodamine B, 37 rose bengal 38 and methylene blue, 39 have previously been claimed to be employed as visible light photosensitizers. A wide range of synthetic dyes have been employed in photoinitiating systems such as acridones, 40 benzophenones, 41 camphorquinones, 42 carbazoles, 43,44 chalcones, 45 chromones, 46 coumarins, 47 cyclohexanones, 48 flavones, 49 ferrocenes, 50 helicenes, 51 naphthalimides, 52 perylenes, 53 phenothiazines, 54 porphyrins, 55 pyrenes, 56 squaraines, 57 and thioxanthones.…”