PSA: you might be thinking of Vantablack which absorbs 99.965% of light—it’s been overtaken by MIT’s “blackest black” which eats 99.995%
NOOOOOOooooooo!
you know there's that ultra black paint stuff? dark as a black hole? absorbs 99.99999% of light. eats up everything you paint it on to a black, flat, featureless nothing?
M.P. Fitzgerald uses it for ink.