Color and pattern male

Head: mahogany-red.

Neck: hackle mahogany-red, each feather with a glossy green-black middle-stripe, running almost parallel to the edge, ends in a point near the tip; shaft black; front of the neck black.

Back, shoulders and wing-bows: mahogany reddish-brown.

Wings: front black; greater-coverts glossy green-black forming a wing-bar when the wing is closed. 

Primary-flights: black with a deep red-brown narrow lace along the outer-web.

Secondary-flights: black with a deep mahogany-red lace along the outer-web, forming a mahogany-red wing-bay when the wing is closed, feather-end black.

Saddle-hackle: similar to the neck-hackle, a slightly deeper shade is allowed, equality is desired.

Tail: main-feathers, sickles and coverts glossy green-black; smaller-coverts mahogany-red laced.

Breast: glossy green-black, some mahogany-red lacing allowed.

Thighs, belly and fluff: black, some mahogany-red lacing allowed in thighs.

Down: slate blue.

Serious faults

White in tail and wing-flights. Much brown in breast. Yellowish glow in hackles. 

Faults

Serious faults to a lesser degreet. Incomplete colored wing-bay.

Color and pattern male

Head: warm reddish-brown.

Neck: hackle warm reddish-brown, each feather with a glossy green-black middle-stripe, running parallel to the edge, ends in a point near the tip; shaft black; front of the neck similar to the breast.

Back, shoulders, saddle and wing-coverts: each feather warm reddish-brown sharpley black multiple laced, parallel to each other and to the outline.

Tail: main-feathers black, both upper feathers black with warm reddish-brown; coverts similar to the back.

Primary-flights: black with a reddish-brown narrow lace on the outer-web.

Secondary-flights: inner-web black, outer-web reddish-brown with black multiple lacing running approximately parallel to the feather-outline.

Breast: similar to the back; lacing extend to the throat.

Flanks, thighs and belly: reddish-brown with black multiple lacing.

Fluff: soft grey-brown.

Down: slate blue.

Serious faults

Too weak or incorrect pattern on the back, shoulders, saddle, breast and wing-coverts. Too light reddish-brown. Peppered instead of clear pattern.

Faults

Serious faults to a lesser degreet. 

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