Studying materials (IMAGE) Washington University in St. Louis Caption Marcus Foston (left) and collaborators are exploring how to use lignin, a common waste product of paper pulping, as a source of renewable alternatives to petroleum-derived chemicals. Credit (Photo: Jerry Naunheim) Usage Restrictions none 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.