Bowl (IMAGE) Field Museum Caption This Maya tripod pottery bowl (Field Museum catalog number 1969.189262) containing copal from Chichen Itza's Sacred Cenote used for sacrifices provided the clues that resolved the mystery of how the ancient Maya produce Maya Blue and how a 14-foot layer of blue precipitate formed at the bottom of the Sacred Cenote (a natural well). It has been part of The Field Museum’s collections for 75 years. Credit Photo by John Weinstein; Courtesy of The Field Museum. Usage Restrictions only with this story 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.