It might be that when the made it some how it could have got alittle hotter and then cooled down to fast. Or it , had discoloration when they bought the copper to make the HS.
It's just oxidation. Copper oxidizes when it comes in contact with air. As long as there is no oxidation where the HS contacts the CPU you should be fine. If there is oxidation, lap the HS a little and it will go away easily.
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