Brownpartridge

Color and pattern of the male

Head: dark-orange.

Neck: hackle dark-orange, each feather has a more or less distinct black shaft-stripe, running almost parallel to the feather-edge, ends in a point near the tip; front of the neck black.

Shoulders: glossy rust-red.

Back: rust-red.

Saddle: hackle dark-orange with more or less distinct shaft-stripe pattern; the absence of pattern is not considered a fault.

Tail: steering-feathers black, sickles and by-sickles green-glossy black with a brown lace.

Wings: bow black; green-glossy black wing-bar.

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

Secondary-flights: inner-vane black, outer-vane brown, forming a brown wing-triangle when the wing is closed.

Breast: green-glossy black.

Belly, thighs and rear-part: black.

Down: greyish.

Serious faults

Straw colored or brownish neck-hackle. Grey or peppered shaft-stripe pattern. Light or uneven color on shoulders, wings, back or saddle. White in tail, wing-flights or down. Insufficient or absent green-sheen in the black ornamental feathers.

Faults

The above serious faults occur to a lesser extent. An incompletely colored wing-triangle. 

Color and pattern of the female

Head: dark orange.

Neck: hackle reddish brown, each feather has a black shaft-stripe; the sharpness of the pattern and the intensity of the shaft stripe are not high demands; the shaft-stripe runs parallel to the feather edge and ends in a point near the tip; front of the neck similar to the breast.

Shoulders: evenly hazel-brown with a fine, even black peppering, without a light feather-edge and with as little light veining as possible.

Back and saddle: similar to the shoulders.

Tail: black steering-feathers, except for the upper-feathers, which like the coverts are colored and patterned similar to the shoulders.

Wings: bow, wing-bar and coverts similar to the shoulders.

Primary-flights: black-brown with a slightly lighter outer-vane.

Secondary-flights: outer-vane similar to the shoulders, inner-vane black-brown.

Breast: a uniform warm salmon-brown, fading to ash-brown towards the thighs.

Belly, thighs and rear-part: ash-brown.

Down: grayish.

Serious faults

Hazel-brown ground-color too light or greyish. Coarse or irregular peppering. Light veining on shoulder, back, saddle and breast feathers. Too pale or greyish breast color. Light lacing on shoulder, back, and saddle feathers. Complete absence of shaft-striping. Light veining (clearly lighter than the ground-color).

Faults

The above serious faults occur to a lesser extent.

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

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