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As dry a climate as one may live in, the razor is still exposed to water during the shave.
As Max said some steels are more prone to rust than others.
If you look thru a microscope you'd be...

It's a form of rust & if it doesn't bother you leave it alone but a light oil after use may prevent more of the same. I know lots of guys don't oil their blades but I can't get away with that in my...