Color male and female

Upper plumage is an even grayish light brown color overall, without any noticeable sheen.

Ornamental feathers of the male, as well as the back-, shoulder- and wing-bow feathers are slightly darker in color.

Down: light khaki to white.

Note

Evenness takes precedence over intensity of color.

Serious faults

Uneven color, too light or too dark overall. Patches that are too dark on the male's shoulders. White in the plumage.

Faults

Serious faults to a lesser degree.

Feather details from:  http://www.kippenencyclopedie.nl

Website from Johan Albada with more than

         5000 photos of chicken-breeds, chicken color varieties and feathers

Genetic code: https://kippenjungle.nl/Overzicht.htm

Website from Henk Meijers with all available information regarding chicken genetics including the world famous 

Chicken Color Calculator