So my mother has a can of black beans that she has been cooking in one of those mini-crockpots, for about 2 1/2 days now. I'm really not sure what her intent is (she has weird cooking habits), but she wants them to soften, and they really don't seem to be getting there at all. The crockpot doesn't have any heat setting, just on or off, but keeps the heat at a bare simmer. They've been covered in liquid in the whole time, so they not drying out, but it seems like they should have broken down a bit by now if they're going to. I haven't cooked with canned black beans before, but I know dry navy beans would have dissolved completely by now. Are black beans different?