Does NASA use Vantablack?

NASA working on its own super black material. "So you could use it in baffles, satellite controls, absorbers for super-conducting detectors.

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Why is Vantablack illegal?

Known as Vantablack, the unique carbon nanotube-based pigment is produced solely by a British company called NanoSystem, and was originally developed for military technologies. However, Kapoor made an agreement with the company that he is the only person allowed to use it for artistic purposes. Consequently, how toxic is vantablack? It was far removed from any people that made Vantablack seem pretty safe. Whatever its toxicity, the chances of it getting into someone's body were vanishingly small. It wasn't nontoxic, but the risk of exposure was minuscule.

And another question, what is the rarest color?

Vantablack is known as the darkest man made pigment. The color, which absorbs almost 100 percent of visible light, was invented by Surrey Nanosystems for space exploration purposes. The special production process and unavailability of vantablack to the general public makes it the rarest color ever. You can also ask what is the third darkest color?

In respect to this, does color exist in the dark?

In the dark we see no colors because the photons are not there and color looses its "color ". Artificial light is bad at reproducing true color . At dusk its almost impossible to distinguish color. It all becomes gray.