Color and pattern male

Head: lemon-yellow.

Neck: hackle glossy vibrant lemon-yellow; front of neck to throat similar to the breast.

Back and saddle-hackle: glossy lemon-yellow for the visible part.

Wings: glossy lemon-yellow shoulder and wing-arch; greater-coverts metallic green-glossy black transverse pencilled 3-4 times wider then those of glossy lemon-yellow, forming a wing-bar with two bands when the wing is closed.

Tail: steering-feathers black; sickles green-glossy black with a faint lemon-golden pencilling at the base, gradually diminishing towards the tip.

Primary- and secondary- flights: strong transverse black pencilled on lemon-yellow, which become narrower towards the feather-tips. 

Breast, belly and thighs: feathers metallic green-glossy black transverse pencilled on lemon-yellow, the black pencilling becomes noticeably wider towards the bottom and rear, tip of the feathers as dark as possible. 

Rear-part: transverse pencilled.

Down: light blue gray.

Serious faults

Extensive pencilling in the hackles. Shoulder and wing-arch not sufficiently vibrant lemon yellow. Weak transverse pencilling throughout the plumage. Transverse pencilling on the upper breast to throat not rising high enough. Weak pencilling in the wing-flights. Complete insufficient sheen in the black pencilling and sickles. Too light a shade in the neck- and saddle-hackle. Horseshoe pattern. Coloration that is much too light, much too dark, or complete uneven. White in tail or wing-flights.

Faults

Serious faults occur to a lesser degree.

Color and pattern female

Head: lemon-yellow.

Neck: hackle lemon-yellow; front of neck to throat similar to the breast.

Back, shoulders, saddle, wing-coverts, breast: feathers metallic green-glossy black transverse pencilled on lemon-yellow, the black pencilling becomes noticeably wider towards the bottom and rear, tip of the feathers as dark as possible. 

Primary- and secondary-flights: slightly more powerfull black transverse pencilling on lemon-yellow, pencilling gradually diminishing in strength towards the tips. 

Tail: steering- feathers become darker towards the tip due to the gradually widening transverse pencilling on lemon-yellow; coverts are green-glossy black along their entire length tranverse pencilled on lemon-yellow.

Belly and thighs: similar to the breast, as strongly pencilled as possible.

Down: light blue gray.

Serious faults

Extensive pencilling on the lower portion of the hackle. Weak transverse pencilling throughout the plumage. Insufficiently transverse pencilling on the upper breast. Weak pencilling in the wing-flights. Far too little black pencilling in the tail feathers. Color far too light, far too dark, or complete uneven. White in the flights or tail.

Faults

Serious faults occur to a lesser degree.

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

Website from Henk Meijers with all available information regarding chicken genetics including the world famous 

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