Corrosion coupled with abrasion. If people washed their faces well in advance, they would eliminate dust in the facial grease. This dust is only partly hard particles - silicon dioxide from rock and other hard stuff. Skin and soft dust is less abrasive. This abrasive part is harder than steel and scratch by scratch wears away the edge. This is well documented. The other wear factor is corrosion - hardened steel corrodes and adges get smaller. Stainless steel does not corrode, but is softer and abrasive wear dominates.
Eventually the feel of a blunting bladed prompts a change, they grab/dig/cut into the face
And some people believe that wiping the blade backwards on a piece of firm cloth like denim hones the edge so that one blade can last several months.
I've tried that several times. In some cases the blade does in fact seem to last longer. In other cases, there doesn't seem to be any improvement at all.
In theory a diamond blade will never corrode and will always be resistant to fine stone grit, but diamond is brittle = edges can get chipped. In theory a stainless steel strip could be coated with plasma deposited diamond and then sharpened = costs ya extra...
One company sells them, there may be more
https://www.cadenceblades.com/materials-coatings/overview/di...
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[ 2.7 ms ] story [ 39.9 ms ] threadYou can use an old toothbrush to clean the edges of the razor to give them more life.
I've tried that several times. In some cases the blade does in fact seem to last longer. In other cases, there doesn't seem to be any improvement at all.
https://www.youtube.com/watch?v=gjSkgz3-2Ig
martensitic steels, is a super-hard alloy, honed through heat and tempering, used in razors, surgical tool, ball bearing, some disc brake
Hardened steel-carbide alloy, this's less brittle,
etc. https://www.wired.com/story/why-do-razor-blades-dull-so-quic...
One atom sharp razor would be awesome. You will notice the cut only by the sound of your detached finger hitting the bathroom floor.