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It was probably not from the WD-40 :) I have never had an adverse reaction to razors scales using WD-40 but I still say probably because one never know for sure, I would say the odds are against it ...

There have been 100's of threads about using Chemicals and various other methods of "Rust" removal, so far not one has been proved to be useful for razors.. basically no one has found an easy way...