Cuckoo silver-neck

Color and pattern male

Plumage: slightly lighter in ground color and slightly brighter in pattern than cuckoo; the upper breast is lighter in shade and less patterned than the breast and belly.

Neck- and saddle-hackle: cuckoo with a silvery white edging.

Back and shoulders: uniform silvery white.

Serious faults

Different colored feathers. Too light ground color. Too wide bands. Yellow tinge in the ornamental feathers. White in the wings and tail. Insufficient shaft stripe pattern in the neck- and saddle-hackle. Cream color in the neck-hackle, on the back, shoulders and/or saddle.

Faults

Slightly too light or too dark ground color. Insufficient pattern in the tail. Presence of a silvery-white edging in the upper breast. Entirely solid-colored feathers.

Color and pattern female

Plumage: slightly lighter in ground color and slightly brighter in pattern than cuckoo; upper breast is lighter in color and less patterned than the lower breast and belly.

Neck-hackle: silvery white with a slight hint of cuckoo pattern, mainly in the lower half.

Serious faults

Different colored feathers. Ground color too light. Too wide bands. Yellow tinge in the ornamental feathers. White in wings and tail. Insufficient shaft striping in the neck- and saddle-hackle. Cream color in the hackle on the back, shoulders, and/or saddle.

Faults

Ground color slightly too light or too dark. Insufficient pattern in the tail. Presence of a silvery white edging on the upper breast. Entirely solid-colored feathers.

Genetic code: https://kippenjungle.nl/Overzicht.htm

Website with all available information regarding chicken genetics including the chicken color calculator.