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That brightly coloured candy or drink you've had-was its colouring dangerous? Bright colour can look alarming, but appearance alone tells you nothing about risk. Many colour additives are allowed when used within limits set by regulators; rules and approved uses differ by region. That doesn't mean all colouring is harmful, or that everyone responds alike. The risk isn't the colour alone. It depends on the additive, the amount, and the person. Most people have no reaction at permitted levels, though uncommon sensitivities can happen. Separately, some studies report small activity or attention effects from certain colours in some children. Evidence is limited: it doesn't show that colouring causes ADHD, or that all children are affected. Usually, no-not when approved colours are eaten within permitted limits. Rare sensitivities and possible small effects in some children are exceptions, not proof that all food colouring is dangerous.