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Erythosine: Being a xanthen-class colorant in the structure of benzoate, erythosine exists the form of red powder or granules. It is added to flavored milk and puddings, ice products, chewing gum and candies, jelly and drink powders [29, 30].
Quinoline Yellow: Quinoline yellow is a synthetic substance used to obtain a greenish yellow color. It is used in soft drinks, jams and canned foods, edible ice, sweets, candies, pickles, sauces, and spices [28].
Brown FK and Brown HT: Brown FK is used in smoked and cured fish, meat, and chips, while Brown HT is used in various biscuits, chocolates, and cakes.
Other water soluble synthetic colorants are Green S, Indigotine, Patent Blue V, Litolurubin BK, Red 2G, Ponso 4R, and Azorubin.
1.4.2.2 Fat Soluble Synthetic Colorants
Artificial colorants soluble in oil or organic solvents are insoluble in water as they do not contain groups capable of forming salt form as in water-soluble colorants. This group of colorants are not allowed to be used for food coloring because of their toxic properties. For example, the use of oil-soluble Penso SX for the coloring of butter and margarine was banned in 1976. Oil Red XO, Yellow AB used in the coloring of orange peels and Yellow OB are not allowed to use because of their toxic properties [31–34].