Labwork (IMAGE) Field Museum Caption Grávalos analyzing Wari ceramic samples using a polarizing light microscope. Ceramics were studied visually prior to being selected for chemical analysis. Credit Photo credit: Cheri Grávalos Usage Restrictions Please include credit 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.