Color male and female

Upper-plumage a uniform, warm, light-yellow, free of lighter veins or flour-colored deposits.

Some black is permitted in tail and wing-flights.

The male's neck- and saddle-hackle, back, shoulders and the female's neck-hackle vivid, warm, light-yellow, somewhat darker than the breast-color.

Down slightly lighter.

Serious faults

Clear different depths of color in parts of the plumage. Too much black, white or grey in the plumage or down.

Faults

Serious faults to a lesser degree. Too light down.

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