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You make a good point. Even if there is heat generated due to friction between the edge and the canvas, the far greater mass of the spine will serve as a heat sink to immediately cool the edge back...

I checked the members google map.

The answer to your question is yes, there is a Fin, and he lives in Helsinki.

Ah, empirical data! Actually I think the only way the canvas heats the blade is by virtue of the increased length of time the razor is held in your warm hand.