Black Perovskite Crystals (IMAGE) KU Leuven Caption In their black state, the atoms in the crystal have reshuffled. Their black colour allows them to optimally absorb sunlight. Credit cMACS 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.