Do you use "black," then?

In my own speech/writing, yes. When interacting with others, generally but I try to be sensitive to their own preferences. If an individual black tells me that he finds the term offensive, I'll ask him to propose another term -- but I'll also try to cast the conversation in ways that let me not have to use a word for the group at all, if I can. Sometimes this just involves letting him steer the conversation more.