Cereals, other packaged foods, sports drinks, other drinks, and fast foods all are examples of food products tending to contain artificial colors. Tons of artificial colors are named as color-numbers, as Red 3, Yellow 5, and Yellow 6. The FDA actually identified Red 3, as a carcinogen (causing cancer!) way back in 1985, even saying it was "'of greatest public health concern,'" and yet, as of 2016, 5 million pounds of it alone have been loaded into food! It also causes allergic reactions! [Cancer certainly is something that isn't just a sensitivity with, say, autism or phenylketonuria: after all, anyone would die by inhaling enough car exhaust.] Further, "Yellow 6... has been found to cause testicular tumors and cancerous growths in the adrenal glands of lab rats." "Red 40, Yellow 5 and Yellow 6...have also been found to contain illegally high amounts of benzidine and 4-aminobiphenyl... known carcinogens."(1)
There are also artificial colors with names likes "rose bengal (RB), phroxine (PL), amaranth, [and] erythrosine B." These last dyes are some of the xanthene food dyes. Various xanthene dyes have been studied to inhibit enzymes metabolizing drugs under light irradiation. Also under light irradiation, red cosmetics with certain xanthene dyes may "react with proteins on skin under lighting and may lead to rough skin."
Sources:
1. Batts, Vicki. "Many food dyes are petroleum-based (and known to cause cancer)." Natural News: Defending Health, Life and Liberty, Truth Publishing International, LTD., 1 September 2016, https://www.naturalnews.com/055165_food_dyes_toxic_ingredients_cancer.html.
2. Mizutani, Takaharu. "Toxicity of xanthene food dyes by inhibition of human drug-metabolizing enzymes in a noncompetitive manner." J Environ Public Health. 2009;2009:953952. Epub 2009 Aug 23. PMID: 20041016. GreenMedInfo, https://www.greenmedinfo.com/article/food-coloring-agents-may-result-liver-toxicity-through-inhibiting-drug-metabol. Abstract.