Tartrazine is a synthetic lemon yellow azo dye primarly used as a food colouring. It is also know as E number E102, Colour Index 19140 or Yellow No. 5. Tartrazine is a commonly used colour all over the world, mainly for yellow, and can be used with Brilliant Blue FCF (E113) or Green S (E142) to produce various green shades. Like many azo dyes tartrazine is manufactured using petrochemicals as starting stock, and was formerly manufactured using chemicals derived from coal tar as the starting material. - Wikipedia.org accessed 11 January 2018
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