Carbon nanotubes are the blackest material I have ever seen. Absolutely Lovecraftian structure.pic.twitter.com/mZHiHnINGA
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There are others now as well. Surrey came out with a lower temp vacuum-applied random alignment coating called VBx 1, plus an open-air low curing temp spray coating called VBx 2. The original Vantablack has also been further improved to essentially unmeasurable levels of black.
Sources indicate the improved variant uses longer and more consistently single-walled nanotubes. Not sure whether further refinements in avoiding pinpoint imperfections were involved as well, but CVD thin film coating companies tend to make ongoing improvements in that area.
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