Unless the cauliflower in the market is extremely fresh, I usually see at least a couple specimens with tiny blackish freckles on the bumpy "flower" surface.
I have assumed the spots were mildew, and tried to avoid them. I even shave that part of the cauliflower a little bit (for esthetics) if I get a head that has them. But they don't seem to taste moldy and aren't ever fuzzy. So I'm curious: is this really mildew, or just a color change that occurs as the cauliflower ages?