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For nuts and bolts probably not. But unless we know the exact steel in a razor, it might be cause for just a little worry. I do my tempering in a Paragon HT furnace that has about a 5 degree cycle...

And a good method. Needs to be done with care so as to not overshoot the temperature and ruin the hardness of the steel. That's nearing the top of the range for tempering temperatures. Baking the...

Some pattern welded blades are treated with gun bluing after etching and polishing to darken the deeper etched lines. This also converts the oxides left there into a more durable form that rusts...