Sunset Yellow food colouring molecule. Molecular model of Sunset Yellow, an organic compound used as colouring in foods such as chocolate, caramel and soft drinks. Sunset Yellow, also known as E110, is very commonly used in the UK, but is banned in Norway. There are concerns over this food colouring being linked to allergic reactions, hyperactivity and temper tantrums in children. Research has shown that behaviour problems increase with higher additive levels in food, so parents have been advised not to give children foods containing these additives. Atoms are colour-coded: hydrogen (pale blue), carbon (gold), nitrogen (dark blue), sulphur (yellow) and oxygen (red).