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, shoulders and wing-bow: uniform silvery white.

Serious faults

Different colored feathers. Too light ground color. Too wide bands. Yellow tint in the ornamental feathers. White in wings and tail. Insufficient shaft-stripes in the hackles. Cream color in the hackles, on the back, shoulders and wing-bow.

Faults

Slightly too light or too dark ground-color. Insufficient pattern in the tail. Presence of a silvery-white edging in the upper breast. Entire 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. Too light ground color. Too wide bands. Yellow tint in the neck-hackle. White in wings and tail. Insufficient shaft-stripes in the neck-hackle. Cream color in the neck-hackle on the back, shoulders, wings and 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. Entire solid-colored 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