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There's a problem being overlooked here.
If the heat sink is in a high radiation environ and it's black, it's going to ABSORB heat from outside - theidea is to shed heat - it can't if it is in the process of absorbing it - so depending that the environment is not radiating - IR black should be better - otherwise it should be reflective - and silver (on board ship (1976) the gun predicter had silver heat sinks all over it (the room was 5 foot square and had the same computing power as a hand held Texas Instrument Calculator!! The tech used to check the predictions with his calculator)) .
As Jeff above said - so much depends on airflow - which has a pretty poor thermal capacity. I plumb for liquid cooled.
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