From silver to gold luster (IMAGE) Chiba University Caption UV irradiation of diacetylene crystals obtained by forming a unique array structure changes the luster from silver to gold. Credit Michinari Kohri from Chiba University Usage Restrictions Do not use without permission. License Original 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.