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I'm not even sure if this a colour but here is Vantablack

https://www.surreynanosystems.com/vantablack

Anish Kapoor has the exclusive right to use it for art so Stuart Semple created the world's pinkist pink available to everyone in the world except Anish. Anish got some anyway.

https://www.dezeen.com/2016/12/30/anish-kapoor-uses-stuart-s...

Other fun colors are https://en.wikipedia.org/wiki/Selective_yellow and https://en.wikipedia.org/wiki/Baker-Miller_Pink

also bastard colors (if for no other reason than the name) https://en.wikipedia.org/wiki/Bastard_color

impossible colors are fun too https://en.wikipedia.org/wiki/Impossible_color

I wonder how effective the coating was at rejecting the thermal radiation? More directly, how much more effective was this than, for example, the white paint used on some airliners by some companies?

"Iron ball paint" is another finish used on military equipment...planes, trucks, etc.

Supposedly, iron balls suspended at different levels in the paint scatters radar and makes whatever it's painted with more stealthy.

Anti-flash white