Note

As the chickens with the mottled color varieties age, the amount of white in the pattern will increase. Two-year old chickens generally have the best pattern distribution.

Color and pattern male

Head: dark warm reddish-brown.

Neck: hackle warm reddish-brown, each feather with a  green-glossy black shaft-stripe ending in a tiny green-glossy black spangle with a white mottle at the tip and a reddish-brown ornamental fringe on the sides; front of the neck similar to the breast.

Back: dark, reddish warm reddish-brown, each feather with a diamond-shaped, green-glossy black spangle and a tiny white mottle at the tip.

Saddle: hackle similar to the neck-hackle, the shaft-stripe and the white mottle are less noticeable because the feathers are much thinner than those of the neck-hackle.

Tail: steering-feathers black, each feather with a white mottle at the tip; sickles and coverts green-glossy black with a tiny white almost V-shaped mottle at the feather-tip.

Wings: bow  almost black; shoulder-arch reddish warm brown-red, sparsely spangled with tinyl white mottles; greater-coverts warm brown-red each feather ending in a large, almost round, glossy green black spangle with a almost V-shaped white mottle, forming a clear black and white wing-bar across the wing.

Primary-flights: inner vane black, outer vane black with a narrow brown-red lace and a tiny white mottle at the feather-end.

Secondary-flights: outer vane warm brown-red, inner-vane dull black widening at the end to the-outer vane connecting to a white mottle.

outer-vane warm brown-red, inner vane dull black and at the feather-end laced with a tiny white mottle.

Breast: warm brown-red, each feather ends in a large, almost V-shaped, green-glossy black spangle with a white mottle.

Belly and thighs: similar to the breast.

Down: grey with a salmon-coloured tint, transitioning to light grey at the base.

Serious faults

Considerably too light or too dark a shade of the warm brown-red ground-color. Considerably too light breast-color. Too strong development of the black spangle pattern on the breast. Too little pattern in the breast feathers. Coarse white mottled pattern. Completely vague blurry pattern. Too much white in the wing-flights.

Faults 

Slightly different shade from the prescribed ground-color. Slightly too much white in the wing-flights. Slightly too much white if older than a year.

Color and pattern female

Head and neck: warm brownish-red , each feather with a  green-glossy black shaft-stripe ending in a green-glossy black spangle with a diamond-shaped white mottle; front of the neck similar to the breast.                 

Back and saddle-cushion: similar to the breast.

Tail: steering- feathers dull black, with a diamond-shaped white mottle; coverts similar to the breast; the upper-covert on each side is covered by a elongated covert, which is, except for the slightly longer black spangle, similar to the other coverts.

Wings: bow, shoulder and coverts warm brown-red, warm brown-red, each feather ends in a large, V-shaped, green-glossy black spangle with a white mottle.

Primary-flights: inner-vane black, outer-vane slightly brown-red laced, lower end of the feathers white laced.

Secondary-flights: outer-vane warm brown to near the end of the feather, inner-vane dull black widening at the end to the-outer vane connecting to a white mottle.

Breast: warm brown-red, each feather ends in a large, almost V-shaped, green-glossy black spangle with a white mottle.

Belly, thighs and rear-end: similar to the breast. 

Down: grey with a salmon-colored tinge, fading to light-gray at the base.

Serious faults

Considerably too light or too dark a shade of the warm brown-red ground-color. Considerably too light breast-color. Too little pattern in the breasts. Coarse white mottled pattern. Completely vague blurry pattern. Too much white in the wing-flights.

Faults 

Slightly different shade from the brown-red ground-color. Slightly too much white in the wing-flights. Slightly too much white if older than a year.

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