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I'm thinking some of the toxic dyes on older scales or tannins on later wood scales could play a part too.

Well yes, celluloid can be an issue if it gases off as it is acidic but I do believe that organic materials can hold moisture & be a problem also especially if in contact with the blade at a friction...

I had a razor that always rusted on one side of the tang. All I could guess was that the oil may have been wiped off on closing if the tang was a bit biased :shrug:

Another spot that commonly...