On: Tested: Black 4.0, the "blackest black" is a lot b...

[trashtester]

Only if it's also "black" in the IR spectrum.

In fact, an object that is completely reflective in the IR spectrum, but black in the visible spectrum would get really hot really easily.

[itishappy → trashtester]

The reverse is also true! An object that is black in the IR, but reflects the visible becomes cooler than ambient temperatures!