On looking up what that might be I found that it may well have been the mold responsible for making one of the most used drugs out there and one of the best known, penicillin. Unfortunately she didn't wait until I could see it and in the end she thinks it was probably more white than blue. Being on dark purple grapes, and in the middle of them, I can see how that might have been the case.
I wouldn't have known the difference but the top one is ok while the bottom one not so much.
You can call either of the sort of white.
Hard cheese I found is fine as long as you cut off the moldy part. There's something about how dense it is that prevents mold from getting too deep into the cheese.