Nope. Chickens see color just fine.
You are mixing that up with the fact that chickens can't count.
That is: you can stick extra chicks under a broody with chicks, so long as they are the same color. She cant count her babies, but she'll kill a buff in her batch of whites if she spots it.
You can always dip her in a bucket of koolaid, but the paste would be a darker color. Leave it on for a 5 minutes, and wash it off.
Blow dry for scraps of dignity.