Hydroxyapatite Crystals (IMAGE) American Chemical Society Caption Hydroxyapatite crystals (pseudo-colored in purple), like those found in human breast cancer, are detected with high sensitivity using an optical contrast reagent and invisible near-infrared fluorescent light. Credit (Photo courtesy of Dr. John Frangioni) Usage Restrictions None 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.