Yup, it was red dye. Wasn’t there a big hullabaloo over red dye some years back?
Yes, red dye, yellow dye and blue dye were all mentioned as causing cancer. But, they have allowed these same dyes back into the food that we eat.
Red dye (#10?) might have been the most recent nasty dye, but there have been many.
If you have a collection of paints like an artist might, a look at the labels will show how many colors are toxic and the base chemicals are or were, depending on findings, used in dyes.
Well, look at China. Lead brightens colors and they’re still using it. China exports most of the toys they make because even Chinese won’t buy them.