eli5 How does razor blade dull on hairs when razor blades are made of steel and they are much higher on mohs scale?
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While friction and collision with the hairs does microscopic damage to the blade, that is not generally what makes the blade dull quickly. When you rinse the blades after shaving, and leave them to air dry, the evaporating water leaves dissolved metal ions stuck to the blade’s point, rendering it “fuzzy” with microscopic crystalline spikes. The way to avoid this is to chase all the water off a wet blade with alcohol or oil before letting it dry. I’ve tried this myself and it can make a disposable blade last 6 months or more.
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