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Wait, I'm confused now. I thought as soon as you find crack you smoke it ;)

I don't think it is the level of humidity, but the fluctuations. Even if you put a solid piece of ivory in such environment it will crack. If you change the humidity slowly it would propagate from...

That's just the nature of the beast. Ivory changes dimensions with changes in humidity, so it doesn't matter if you put it in water - if the humidity fluctuates (quite likely in a bathroom) it...