Darkest manmade substance

The darkest man-made substance is a low density carbon nanotube array created by researchers from Rensselaer Polytechnic Institute (Zu-Po Yang, James A. Bur, Prof. Shawn-Yu Lin) and Rice University (Dr. Lijie Ci, Prof. P.M. Ajayan) (both USA). The substance demonstrated reflectance of 0.045% when tested at Rensselaer Polytechnic Institute on 24 August 2007