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I mostly agree. Most heat generated would be dissipated going from the canvas to the leather. Also I agree that only a few 'microns' of the edge MAY be heated substantially. This happens on both...

It's a bit of both. Take your hand and rub it back and forth quickly about 10 times on your bed sheets. This is not as course as a rug but will generate heat and warm your hand. Better yet, rub...

What was the question? :shrug: Regardless of what you rub/strop your blade on it will heat up. Some materials will generate more heat than others. Remember carpet burn? Right after the carpet...