Color and pattern male

Head: silvery white.

Neck: hackle silvery white, each feather with a bright blue shaft-stripe, running parallel to the edge, ends in a point near the tip; vein and front of the neck  bright blue.

Back, shoulders and wing-bow: silvery white.

Tail, wing-bar, wing-flights, breast, thighs, belly and fluff: bright blue.

Down: dark-grey.

Serious faults

Yellow tint and insufficient shaft-stripes in the hackles.

Faults 

Minor deviations in color and pattern. Too pale, too dark, or uneven blue. Complete or partial black feathers.

Color and pattern female

Head: silvery white.

Neck: hackle silvery white, each feather with a bright blue shaft-stripe, running parallel to the edge, ends in a point near the tip; vein and front of the neck  bright blue.

Back, shoulders, wings, tail, saddle, breast, thighs, belly and fluff: bright blue.

Down: dark-grey

Serious faults

Yellow tint and insufficient shaft stripes in the  neck-hackle.

Faults 

Minor deviations in color and pattern. Too pale, too dark or uneven blue. Complete or partial black feathers.

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