Healable sulfur cathode - 2 (IMAGE) University of California - San Diego Caption The cathode material heals by melting from a brown powder to a deep purple-red liquid. Credit David Baillot/UC San Diego Jacobs School of Engineering Usage Restrictions Please credit: David Baillot/UC San Diego Jacobs School of Engineering 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.