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UK firm Surrey NanoSystems produces Vantablack, the current record holder for the least-reflective material.
"There are probably 50 shades of black, if not more. But sometimes, and especially where physicists are concerned, even the blackest black isn’t black enough.
For many years, NASA has used a black paint manufactured by the international aerospace corporation Lord that has a reflectivity of just 3.5%. That’s several per cent lower than conventional black pigments. Dubbed Z306, it was applied to the Hubble Space Telescope, as well as other NASA instruments, to reduce stray light from the Sun, Moon, Earth and indeed the telescope’s own housing. Without it, all those images of distant galaxies and novae might not have appeared quite so spectacular."
Read full article on Physicsworld