Measuring the Darkest Manmade Material (IMAGE) Rensselaer Polytechnic Institute Caption The vertically aligned carbon nanotube samples were mounted in the center of a integrating sphere, which measured the material's reflectivity. Credit Rensselaer Usage Restrictions Please include photo credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.