Foods and drinks containing the colour must be labelled: "[name or E number of the colour(s)]: may have an adverse effect on activity and attention in children". This applies to the six "Southampton colours" including Carmoisine / Azorubine (E 122).
The EU legally requires foods containing Azorubine (Carmoisine, E122) to carry a warning that the colour may have an adverse effect on activity and attention in children.