The dismutation process of semi thiazine dyes has been investigated in aqueous solutions as a function of pH using paraphenylene diamine as electron donor. We have found that the stable specie in neutral solution is the protonated semireduced dye TH . From the kinetic data it appears that contrary to what would be expected from previous work, the rate of dismutation is nearly constant with increasing alkalinity of the solution.
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Bonneau et al. (1968) studied this question.
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