According to the latest reports, Pepsi-Cola was found to be still using a caramel coloring 4-MI, which contains controversial compounds linked to cancer. The appalling revelation was even more so as the manufacturers of this beverage had promised over a year ago to phase out the carcinogenic chemical. This was found in all Pepsi and Coke products except in California.
4-MI, an artificial brown coloring is created by the reaction of corn sugar with sulfites and ammonia under high temperatures and pressures. This produces 4-methylimidazole or 4-MI and 2-methylimidazole. Both of these chemicals have been found to cause cancer of the thyroid, liver and lung in lab mice and rats. It was added to the list of toxic chemicals covered by the Safe Drinking Water and Toxic Enforcement Act of 1986 of California, also known as Proposition 65.