Tartrazine (otherwise known as E102 or FD&C Yellow 5) is a synthetic lemon yellow azo dye used as a food colouring.

It is found in certain brands of fruit squash, fruit cordial, coloured fizzy drinks, instant puddings, cake mixes, custard powder, soups, sauces, kool-aid, ice cream, ice lollies, sweets, chewing gum, marzipan, jam, jelly, marmalade, mustard, yogurt and many convenience foods together with glycerin, lemon and honey products.

It may be found in the shells of medicinal capsules. It can also be used with E133 Brilliant Blue FCF or E142 Green S to produce various green shades (e.g. for tinned processed peas).

There is an urban legend that the tartrazine in Mountain Dew causes shrinkage of testicles. ^* This legend is false, tartrazine has been deemed safe and used since 1917.

Tartrazine is a very commonly used colour in the United Kingdom and the United States. Use of tartrazine is banned in Norway and Austria.

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