How to make something that's darker than Vantablack

It’s not really a spoiler, is it? I figure if one is commenting on the video, one has probably watched the video. (It kind of feels rude to do otherwise.) If one has not watched the video yet leaps into comments, then that is surely because one is wondering how he “made something darker than Vantablack” and wishes to cut to the chase and get the answer without watching the video?

/runs to do search without safe search turned on
Whew, saucy!

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