Testing the new material (IMAGE) Aalto University Caption In this experiment, the gel is being activated by a red LED before the researchers measure the light it transmits. Credit Joonas Ryssy / Aalto University Usage Restrictions May be used in publications related to this release with appropriate credit. 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.