One other thing just occoured to me. Here is a question for others. Based on a previous post here on the board, If you were roaming around the desert and found a chunk of old concrete with some chips in it, Would you completely remove the chips? Or would you carefuly expose them and leave them in small chunks of the concrete?

Personally, I might expose some of them but leave them in the concrete. That is a very important part of their history and I feel would be highly desirable. Of course this is assuming we are not referring to a 10' piece of an old floor or something.