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Maggard does a great job, that video is worth watching. I think by cooling the blade he is preventing the loss of temper - but I'm no metallurgist.

There is a video on Maggards site where he is buffing a razor. He dips the razor in ice water when it gets warm in his hands as he is buffing through different compounds.

Caveat Emptor: the commercial principle that the buyer is responsible for making sure that goods bought are of a reasonable quality, unless the seller is offering a guarantee of their quality. ...