Ivory study image 2 (IMAGE) University of Bristol Caption Dr Rebecca Shepherd with mammoth ivory samples obtained from the natural history museum. In the background, the benchtop Raman spectrometer is shown Credit Dr Rebecca Shepherd Usage Restrictions The image must only be used to illustrate this study and must not be used for commercial purposes 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.