Red40 is a type of food coloring made from
petroleum that is known for causing allergic reactions, migraines and mental disorders in children. This however is apparently not scientifically proven and the dye is deemed safe (enough) to use by the European Free Trade Organization. But there was a controversy surrounding Red Nr 3, which is banned in Europe, and recently also in California. It made Skittles temporarily not sell anything over there, because they had to change the ingredients because they used red dye nr 3. So maybe people confuse the two?
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