Glycerol as a Waste Feedstock (IMAGE) ETH Zurich Caption Crude biodiesel contains substantial amounts of glycerol (dark phase), which in turn can be used to produce bioplastic. Credit Bo Cheng / ETH Zurich Usage Restrictions This picture may only be used in connection with press material from ETH Zurich 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.