There are some other independent studies by a Danish group, a German group, et al., and also myself. Nishimura is not alone on the unreliable protection of selenium treatment, although not many people may agree on his "sulfur impurity" theory. I think he only mentioned this theory as one possibility to account for his observations and he did not intend to establish this as a fact or anything.Originally Posted by Jorge Gasteazoro
The inclusion of ammonium thiosulfate is to accelerate selenium toning reaction.I beleive the inclusion of ammonium thiosulfate as part of KRST has a big role in the permanence properties of selenium toning, but apparently it is something that has not been researched.
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