Cotton Candy Blizzard Color

My favorite blizzard at DQ is the cotton candy, but I've noticed that the color can differ a lot. Sometimes it's pink, and sometimes it's plain white. I feel like when it's white, they either forget to add or don't have whatever ingredient makes it pink. And the white doesn't taste as good (just tastes like plain softserve, which could be placebo effect for all I know), so I was wondering about if anyone knows why this happens, whether I'm crazy about it tasting different, and any general info. Thanks!