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just going to take a guess here but you just said the dark parts are smoother and shinyer than the light parts that tells me the tang isn't dead flat...the belt is smoothing out the high spots (wich would be the darker areas) but the rest could be low spots so if its not getting ground equally it will show a different color this also explains why in the pictures the lighter areas are still have heavy scratch marks....only way to fix it is to go back to square one with a 60 or 80 grit belt and make aeverything dead flat....its hard to tell by a picture seeing in person would be better but that's my guess
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