Multifunctional Graphene Hair Dye (IMAGE) Northwestern University Caption This photo shows hair before (blonde) and after (black) the application of graphene-based hair dye. Credit Jiaxing Huang, Northwestern University 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.