If you use barium for a cat scan will your stool be white?

No, barium does not turn your stool white. After a barium X-ray, it is possible for the contrast dye to make your stools appear light-colored or even white-colored. This is a temporary side effect that should resolve on its own within a few days. However, if your stool remains white or light-colored for more than a few days, or if you experience any other unusual symptoms after a barium X-ray, it's important to contact your doctor to discuss further.