Color and pattern male

Head: silver-white.

Neck: hackle silver-white, each feather with a bright-blue middle-stripe, no high demands on the sharpness and the intensity, ends in a point near the tip; front of the neck bright-blue.

Back, shoulders and wing-bows: silver-white.

Saddle-hackle: silver-white, each feather with a more or less distinct black middle-stripe, absence is not considered a fault.

Tail: main-feathers, sickles and coverts bright-blue.

Wings: front and wing-bar bright-blue.

Primary-flights: bright-blue with a narrow white edge on outer-web.

Secondary-flights: inner-web bright-blue, outer-web white, forming a white wing-bay when the wing is closed.

Breast: bright-blue.

Thighs, belly and fluff: blue.

Down: greyish.

Serious faults

Yellow tint in hackles. Rusty brown or red on back, shoulders and wing-bows. Extensive white on breast, thighs and belly. White in tail. Strongly deviating or uneven blue.

Faults

Serious faults  to a lesser extent. Incomplete colored wing-bay. Complete lack of middle-stripes.

Color and pattern female

Head: silver-white.

Neck: hackle silver-white, each feather with a bright-blue middle-stripe, no high demands on the sharpness and the intensity, ends in a point near the tip; front of the neck similar to the breast.

Back, shoulders, wing-coverts and saddle: light-grey with fine evenly distributed bue peppering, minimal light-colored shafts, slightly light lacing allowed but not desired.

Primary-flights: blue-grey with a narrow greyish-white edge on the outer-web.

Secondary-flights: outer-web similar to the back; inner-web greyish-white.

Tail: bright-blue main-feathers except for the upper ones, which like the coverts are light-grey with blue peppering.

Breast: salmon shading off to light-grey at the thighs, shafts salmon.

Thighs, belly and fluff: ash-grey.

Down: greyish.

Serious Faults

Red or rust on wings. Brown sheen on back, saddle and wing-coverts. Light veins. Yellowish tint in the neck-hackle. Complete lack of middle-stripes.

Faults

Serious faults to a lesser extent. Slightly clumped peppering and light shafts on the breast.

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 Calculatorr