Dye Experiment (IMAGE) University of Wisconsin-Madison Caption Grown on a dye that turns blue when it binds to iron, yeast that acquired a new ability to scavenge iron from bacteria turn the dye orange as they soak up nearby iron. Credit Chris Hittinger and Drew Doering 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.