"Ken Muldrew" wrote in message
...

I still don't understand how a steel razor blade dulls so quickly
cutting hair. The difference in hardness is enormous and yet somehow
the razor's edge deteriorates.


Have you noticed that a carbide tipped blade is harder than wood and it also
dulls? The hardness is enormous at the back of the blade but at the cutting
edge you can make it flex by simply rubbing you thumb nail against it. The
micro thin edge is very thin and simply wears away. When I sharpen my
chisels I get a wire edge that is more flexible than aluminum foil.