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Wouldn't you think a prolonged soak in low heat, if anything, would promote a more complete tempering, and more toughness, and (what seems like a foreign possibility to me) less hardness if anything?...

Ditto all of that, have done the same, though just one "pling!!!" from the wire brush and one razor that I blued a noncritical part on hard felt. It's easy to damage them that way, not so easy with...

I'd agree with this. The lowest temper that I'm aware of in any tool steel is white #1, which has more carbon than most (and at the high end, probably all) razors and nothing or near nothing (like...