Quote Originally Posted by Argranade

It can make them very sick because there so young, they probably won't last too long if that dye is not removed, those chicks will want to preen them selfs and in doing so they can inject food colouring into there system.

Food colouring can make birds very sick, that's also why you should never dye water red to attrack humming birds because it can make them very sick.
Once again, the dye is ALREADY injected into their system. So ingestion by preening would be pretty inconsequential.