Dyed chicks are sold by street vendors in countries like China, Philippines, India, Malaysia, Morocco, Yemen and evens the USA. But what most people don't know is that these cute baby chicks aren't dyed after hatching, they are injaected with dye as embryos, inside the egg.
Some vendors inject the eggs with stuff like hydrogen, peroxide and ammonia, while other use 'harmless' food colouring.  In reality, while some chicks prove extremely resilient to dye, many are intoxicated and DIE before hatching.

(source: additycentra.com)