: I've encountered a strange phenomenon that I'm hoping someone can shed some light on...

: Last week I was sitting at my computer waiting for the bath to fill when I heard a cracking and popping issuing forth from the bathroom. What I observed was my sink cracking off shards of porcelain! All around the outer, top edge, cracks were forming and pieces were popping off! I've never encountered anything like it.

: The building I live in was built in the mid-20's and while I don't expect that the sink was that old, it's not new. A two piece, pedestal type, the sink bowl appears to be cast iron and rests on the pedestal.

: Have any of you encountered anything like this? The only explaination I can come up with is the combination of a chilly night Vs the warming of the air from a filling tub. Is that possible?