Although the Hawk can just get supersonic (in a Hawker Siddely shallow dive) I hardly think it counts in the 'high speed' area Konkordski is asking about, an area about which I know nothing.
However, I recall that it took a very clever psychologist to convince the forces that dark was a better colour for conspicuity. So, while I am almost as synical as checkboard, the black colour was used on training aircraft as it is proven to aid conspicuity and one can achieve visual contact at longer range.
Akin the glider argument, there was some discussion whether the Slingsby Fireflys would overheat in the sun on the ground and cause damage to the composite structure, but they must have sorted it as I have seen these black as well (unless the weather in Lincolnshire made that argument defunct as well!).
Regards.
av8er