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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If you use knives every so often you need to strike it against a steel to get the edge back. The steel does not sharpen the knife it straitens out the edge so it cuts a again. https://www.sharpeningsupplies.com/How-to-Use-a-Sharpening-Steel-W62.aspx
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