The effect of polyanions poly(potassium vinyl sulfate) (PVS), poly(sodium acrylate) (PANa), and poly(potassium p‐styrenesulfonate) (PSS), on the alkaline fading reaction of methylene blue (1) was investigated. The fading rate of 1 was extremely retarded on addition of polyanions. The binding type of 1 to polyanions was investigated spectrophotometrically by following the changes in the molar absorption coefficient (ε) at 664nm band. The relationship between the binding type and the fading rate of 1 in aqueous alkaline solution of polyanions is discussed.
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Shirai et al. (1978) studied this question.
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