Before and after: water purification test (IMAGE) KTH, Royal Institute of Technology Caption An aqueous solution with methylene blue before and after being treated with the lignocellulose hydrogel developed at KTH Royal Institute of Technology. Credit Giuseppe Melilli 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.