The Musou Black paint can reportedly absorb 99.4-percent of visible light.
Musou Black', One Of World's Blackest Paints, Makes Objects Vanish Into A Void - DesignTAXI.com
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MUSOU BLACK, World Blackest Acrylic Paint, 100ml x 2 Pack, 3.38 Fl Oz (Pack of 2) : Arts, Crafts & Sewing