I picked up some waxworms yesterday, and today, most of them have changed color to black and aren't moving. I am told these things are supposed to be really hardy... why are they dying so quickly? I keep them in a dish with some breakfast cereal and a small amount of honey.
I just leave mine in the tubs that they come in. Sounds like they are dying if they are turning black. When they pupate they turn brown and hard. A photo might help us to understand what's going on.