So I picked up a BM 440 Opportunist today - this was special ordered for me, and was on backorder at the time, so this is truly a new knife. It's great (well, became great after I re-profiled the edge), but I didn't notice until I had already left the store that it has black spots on the blade. Anybody know what this is? Before the suggestion comes up, I've already tried a simichrome type polish.