Does anyone have any tips for removing black spots/coloring from a blade? I started with some metal polish hoping that would remove it with no luck. The blade feels very smooth. I started sanding and got some to come off the tang after a lot of sanding. It looks as though there is small pitting that the black coloring is in. I don't mind the pitting if it's there. I would just like to get rid of the coloration. I planned on stopping to pick up some more sand paper this evening, as the lowest wet/dry grit I have it 220. I wanted to make sure there wasn't a way around removing a lot of metal before I did so. It's a 6/8 Joseph Rodgers and Sons Cutlers to Their Majesties. Sorry for the bad pictures, but I though they might help some.