Food coloring

I have been hearing food coloring is dangerous for children because in a primary school production of Bugsy Malone we're having custard pies and I decided to make them Tiswas style and use food coloring, but will it be dangerous to get food coloring in children's mouths for three nights in a row (Pie in face) In the end everyone gets splurged so should I alter the flan idea or will it be OK after left for one hour.

Food coloring is often seen as a harmless, fun additive to food. However, some food colorings can have adverse affects on consumers; it is best to know the dangers of food coloring and the risks associated with them.