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I've used hot water & a hair dryer to aid in the etching process with acids. It's amazing watching the red stuff form before your eyes.
Another oddity that one may be un/fortunate to see is the...

Things I've experienced with my or other people's razor's.
1. Even if oiled steel can rust if there is cell rot present or the scales rub on the blade hence removing the oil.
2. Enough silica gel...