Bresse Chicks, Blue Legs

[Southern Chicken Momma]

Good Day Bresse Breeders!
I have five 5 week old Bresse chicks; 1 cockerel and 4 pullets. My question is when do the chicks legs turn "blue"? Some of the chicks already have blue legs and some not. I'm just worried that I didn't get pure bred Bresse stock...if all the chick legs don't eventually turn blue.
Anyone have experienced knowledge about the blue leg time frame?

 

[FoodFreedomNow]

I raise American Bresse, and find that leg color usually manifests quickly - certainly by 5 weeks. Even among pure lines, the depth of color may vary.

A pic of your chicks' legs would be helpful.