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The only time something doesn't reflect light is if it's painted in that special black that's even darker than vanta black, because that's what makes it so black; it absorbs all light instead of reflecting any.
And even that reflects a teeny tiny bit of light.
A coating, which is made from vertically aligned carbon nanotubes. Absorbs 99.995% of visible light. Vanta: A mere 99.96%.
Black holes don't reflect any light at all as far as I know. They do emit some light via hawking radiation, but that's not really reflecting.
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