Methyl yellow

In aqueous solution at low pH, methyl yellow appears red.

[4] Butter yellow was synthesized by Peter Griess in the 1860s at the Royal College of Chemistry in London.

It was in the 1930s that research led by Riojun Kinosita showed the link between several azo dyes and cancer, linking butter yellow to liver cancer in rats after two to three months exposure.

[7] In 1939, the International Congress for Cancer Research issued a recommendation for the banning of cancer-causing food dyes (including butter yellow) from food production.

dougan 豆乾) from Taiwan were found to have been adulterated with methyl yellow, used as a coloring agent.

NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oil Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code