Black raspberries are raspberries. The red things are "other uninteresting fruit". Unfortunately that has not been the way the market went. From what I have seen, one factor might be the fragility of the blacks. They deteriorate rapidly. But Damn, they are good. Once you have had black, you won't go back.
S_ Dave - if you can make an economical plant care package I would pay shipping for interesting leftovers. I am currently working on a more basic problem - no dirt. What I have really does not fit my definition of dirt. I am trying to figure out what to do with it.