Color and pattern male

Head: warm golden-buff.

Neck: hackle glossywarm golden-buff; front of the neck similar to the breast.

Back, shoulders, wing-bows, saddle-hackle and breast: glossy warm golden-buff.

Wing-bars: golden-buff, inner-web faintly flour-white transverse pencilled.

Primary-flights: inner-web flour-white, outer-web golden-buff.

Secondary-flights: inner-web warm golden-buff flour-white transverse pencilled, outer-web golden-buff except the tip where the pencilling continues.

Tail: main-feathers mealy-white; sickles and coverts flour-white with a narrow, sharply defined golden-buff lacing.

Breast,flanks, thighs and belly: warm golden-buff, flanks show some flour-white pencilling.

Fluff: mealy-white with a brownish tinge.

Down: cream-colored.

Note 

Hen-feathered males correspond entirely in color and pattern females.

Serious faults

Significant uneven or too light ground-color. Too dark or too light hackles, shoulders and wing-bows. Too broad or very irregular lacing of sickles or tail-coverts. Absence of  sickle-lacing. Much blackish splashes in the flour-white plumage.

Faults

Serious faults to a lesser degree. Color of the pencilling other than flour-white.

Color and pattern female

Head: warm golden-buff.

Neck: hackle warm golden-buff, some flour-white penciling allowed at base of the hackle; front of the neck similar to the breast, but slightly less strongly pencilled .

Back: warm golden-buff, each feather with flour-white fine straight tranverse pencilling, slightly wider than those of golden-buff.

Shoulders, wing-coverts and saddle: warm golden-buff, each feather with flour-white fine straight tranverse pencilling, approximately as wide as those of golden-buff. 

Wing-flights: warm golden-buff, with straight flour-white tranverse pencilling, slightly wider than as those of golden-buff.

Tail: main-feathers and coverts warm golden-yellow, each feather with flour-white fairly finely and straight transverse pencilling, slightly wider than as those of golden-yellow.

Breast, flanks and thighs: similar to the shoulders, pencilling on the breast should retain as much as possible towards the top and not fade out too strongly.

Belly and fluff: warm golden-buff with flour-white pencilling or peppering.

Down: cream-colored.

Serious faults

Ground-color uneven, much too light or much too dark. Coarse or very irregular pencilling. Insufficient colour-depth and sharpness of the pencilling. Insufficient pencilling on the breast. Pencilling extending too high into the neck-hackle.

Faults

Serious faults to a lesser degree. Ground-color in the pencilling. Color of the pencilling other than flour-white.

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