A test for uzhim (if one is needed) is to toss the troll into icy water. If he or she can survive treading water for a while, uzhimdom is proven. The length of the test depends on the cruelty of the test-giver.
Actually, uzuz can pass the uzhim test, too. An uzuz's skin is freezing to the touch, whereas other trolls are merely cold. (An enlo's skin is cool.) According to Peter Michaels, if a non-Darkness rune creature touches an uzuz's skin, you get an effect like touching freezing metal: if there's any dampness, the non-Dark-runer's skin freezes to the uzuz. Serves you right for trying to touch one.
The coldest thing in Glorantha, IMHO, is an uzuz's internal organs. I don't think it's the heart that's actually the coldest. Maybe the liver.
Standard disclaimers apply. YMMV.
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