DR TIM EVANS / SCIENCE PHOTO LIBRARY DR TIM EVANS / SCIENCE PHOTO LIBRARY
Sudan 2. Computer model of a molecule of the dye Sudan 2. It has the formula C18.H16.N2.O. The atoms are shown as spheres and are colour-coded: carbon (light blue), hydrogen (white), nitrogen (dark blue) and oxygen (red). Sudan 2 is a red industrial dye. It is used to colour oils, waxes, petrol and shoe and floor polishes. It is also used to colour food products, although its use has been banned in the European Union since 1995 when it was found to cause malignant (cancerous) tumours in rats fed on the dye.
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