Extraction process (IMAGE) University at Buffalo Caption Extracting and analyzing leaf wax chemicals from ocean-bottom and other sediments is a complex process. This photo shows just one of many steps: The vials hold what scientists call the acid fraction, which contains materials including leaf wax chemicals. Credit Allison Cluett Usage Restrictions This image can only be used in news stories discussing the research in the related press release. 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.