It's beyond black-out. As in, if the English had had curtains made out of Vantablack, the Nazi bomber pilots would have thought they were still flying over the Channel ~ or maybe into a black hole (if they had known what a black hole was). It's blacker than black, and all because of little carbon nanotubes (as in, "vanta," or "vertically aligned nanotube array") that trap visible light, which bounces around between them until only 0.035 percent remains. And now, there's a spray paint version of the amazing material. Imagine the possibilities in art, design, and architecture: https://www.1843magazine.com/design/his-dark-materials
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