Blue brassy-back

Color and pattern male

Head and neck: bright-blue , some brown on the hackle allowed; front of the neck similar to the breast.

Back, shoulders and wing-bows: bright-blue with brass mixing. 

Saddle-hackle: bright-blue with a blurred brown-yellow feather-edge.

Tail: bright-blue, some white at the base of the main-sickles is allowed.

Primary-flights: bright-blue.

Secondary-flights: bright-blue, some blurry brass marking in the outer-web is allowed.

Breast: bright-blue

Belly, thighs and fluff: bright-blue

Down: grey

Note

Brass-color is under the influence of blue dilution slightly lighter.

Serious faults

Clear visible middle-stripes on head and neck. Marking on the primary-flights. Extensive marking on the outer-web of the secondary-flights. 

Faults

Serious faults to a lesser degree. Too yellow or too light ground-color on back and shoulders. Excessive white in the tail. Too dark or uneven blue. Entire or partial black feathers.

Color and pattern female

Head and neck: bright-blue, some brown on the hackle allowed; front of the neck similar to the breast.

Back, wing-coverts and saddle: bright-blue with a brass vein and a cream to blurred brownish feather-edge is permitted.

Tail: bright-blue

Primary-flights: bright-blue

Secondary-flights: preferably entire bright-blue but may show some blurred brown marking on the outer-web.

Breast: creamy to light brown in the center; towards the outside mixed with some bright-blue; shafts are lighter tinted and clearly distinguishable.

Belly, thighs and fluff: cream to light-brown with some bright-blue mixing.

Down: grey

Note

Brass-color is under the influence of blue dilution slightly lighter.

Serious faults

Clear visible middle-stripes on head and neck. A clear sharp feather-edge on back, saddle and wing-coverts. Extensive marking on the secondary-flights. Marking on the primary-flights. 

Faults

Serious faults to a lesser degree. Complete absence of the brass shaft on back, wing-coverts and saddle. Too dark or uneven blue. Entire 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