Red and Yellow Beets (IMAGE) University of Wisconsin-Madison Caption Slices of different colored beets show the presence of betalains, a class of yellow and red pigments unique to the wider beet family, the Caryophyllales. Credit Sarah Friedrich Usage Restrictions Credit to Sarah Friedrich 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.