Color and pattern male

Neck- and saddle-hackle, back, shoulders and wing-bar: warm reddish-yellow, each feather several times crosswise interrupted by a light-grey, slightly arched, bar;  a light-grey tint on the back is allowed; front of the neck similar to the breast.

Primary-flights: dark blue-gray, several times crosswise interrupted by light blue-grey, slightly arched, bars; a brown tinge is allowed.

Secondary-flights: several times crosswise interrupted by lighter, slightly arched, bars; inner-web dark blue-gray, outer-web yellow-brown, forming a wing-bay when the wing is closed. 

Tail: dark blue-grey, several times crosswise interrupted by light-grey, slightly arched, bars; a brown tinge is allowed.

Breast, thighs and belly: yellow to light-reddish, each feather several times crosswise interrupted by lighter, slightly arched, bars; a grey tinge is allowed.

Down: grey.

Serious faults

Lack of yellow-red in the breast, thighs and belly. Incomplete colored wing-bay.

Faults

Minor deviations in color-depth and pattern.

Color and pattern female

Neck: hackle golden-yellow, each feather with a middle-stripe and several times crosswise interrupted with faint light-grey bars; front of the neck similar to the breast.

Plumage: light red-partidge with peppering, each feather several times crosswise interrupted by a lighter-colored, slightly arched, bar without peppering, on the wings almost spangled; smooth shading between dark and light bars.

Breast: salmon-red without barring.

Down: grey.

Serious faults

Predominant grey color in the plumage. Black upper neck-hackle. Other than a reddish-yellow breast.

Faults

Minor deviations in color-depth and pattern.

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