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Slice it while it's still relatively soft (but not too soft), then cure for three to six weeks, depending on water content.
How were the cans insulated? Could it possibly have gotten a little overheated?
Athena, after you pour your soap, sometimes it needs to be insulated in order to reach the gel stage. If you're using milk, it's highly unlikely that you'd need to insulated to get to gel, but if you'd made, say, an all-olive oil soap, you'd probably have to insulate to get it warm enough to gel. Some people wrap their molds in towels and things--I usually just toss a thick throw blanket over mine. Once I have gel all the way into all corners of the mold, I remove insulation, if any, or take the lid off the mold. With milk soaps, I've also placed the molds in front of fans or outside if it's cold, to better cool them down and prevent overheating.