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:tu One of these days your students will talk you into trouble...

I am guilty of being practical in this matter. I have access to LN at work. Have I tried this on blades of my own? Of course. There just wasn't enough benefit shown to be worth the money spent...

For practical purposes, say in the context of a human lifetime, the changes will be permanent. There are some anecdotal reports of historical blades (swords) being of a legendary level of hardness,...

Essentially the deep freezing causes the crystalline metallic structure to form a smaller shape, packing more crystals into a tighter lattice.

For copper wire there should be greater contact...

Here's a thread where I posted some of my thoughts a few months ago, about cryo applications to steel. The principle of how deep freezing works would be the same for speaker wires, just limited to...

What sort of materials do you do cryo treatment to?