It's not any different than injecting a vaccine a week before hatching, which tons of hatcheries do. It obviously doesn't hurt the chicks and the color goes away when they get their adult feathers.
they don't stay green? bummer. I could have camo-chicks, and the foxes would never see 'em!
I think it's mean... i can't imagine being steeped in any kind of dye for a week while one is developing could be a good thing... there must be some side effects...
I don't think it is mean at all. They seem healthy, and the dye will fade in time. People dye their hair all the time, you can put dye into frosting and eat it, so I don't really see any harm here. cute pics