Color and pattern male

Head: silvery-white.

Neck: hackle silvery-white, each feather with a bright-blue shaft-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-arch: silvery-white.

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

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

Wings: bow and wing-bar bright-blue.

Primary-flights: bright-blue with a narrow white edge along the outer-vane.

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

Breast: bright-blue.

Belly, thighs and rear-part: blue.

Down: greyish.

Serious faults

Yellow tint in neck- and saddle-hackle. Rusty brown or red on shoulders. Extensive white on breast, belly and thighs. White in sickles and tail. Strongly deviating or uneven blue.

Faults

Serious faults occur to a lesser extent. Incomplete colored wing-triangle. Complete lack of shaft-stripes.

Color and pattern female

Head: silvery-white.

Neck: hackle silvery-white, each feather with a bright-blue shaft-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, saddle, shoulders, bow and wing-coverts: light-grey with fine evenly distributed bue peppering, minimal light-colored veins and  slightly light lacing permitted but not desired.

Primary-flights: blue-grey with a narrow greyish-white outer-vane.

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

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

Breast: salmon transitioning to light-grey at the thighs, veins salmon.

Belly, thighs and rear-part: 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 shaft-stripes.

Faults

Serious faults occur to a lesser extent. Slightly clumped peppering and light veins 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