SYNTHETIC COLORS ~ These and all dyes should be avoided. They are labeled FD&C and a number after it. These are believed to be carcinogenic. Blue 1 and Green 3 are carcinogenic, Yellow 5,6 and Red 33 have caused cancer when ingested and applied to the skin. These contain coal tar and may contain arsenic and lead, which are also carcinogenic. Lipsticks are full of these! Note: lipsticks can also contain LEAD!