Telling chicks apart

[Hawkscountry75]

What is the best way to tell Dominique and black australorp baby chicks apart? They are about a week old, maybe a little older. Thanks so much in advance!

 

[Ol Grey Mare]

Dominiques, being barred, should have a dot on the top of their head. Australorps should not have a dot on their head. Dominiques *should* have a rose comb bud, and Australorps should show a single comb bud.