Crystals, Clearer ... (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This image shows the crystal shape and height of a material known as PTCDA, with height represented by the shading (white is taller, darker orange is lowest). The white scale bar represents 500 nanometers. The illustration at bottom is a representation of the crystal shape. Credit Berkeley Lab, CU-Boulder Usage Restrictions None 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.