Yellow 36 Acid Dyes commonly known as metanil yellow dye is a non-toxic coloring agent having a chemical formula of C18H15N3NaO3S with an average molar mass of 376.39 grams per mol. It is commonly used in agriculture sector to impart yellow color to food and spices such as arhar dal, turmeric powder, and many more. Yellow 36 Acid Dyes can also be used in chemical laboratories to determine pH level by changing color.