Color male and female

Upper-plumage of an even, warm, isabel-yellow color throughout, free from lighter shafts or other discoloration.

The male's neck- and saddle-hackle, back, shoulders and the female's neck-hacklevividly glossy warm isabel-yellow.

Down color slightly lighter, free from other colors.

A harmonious matching of the different parts of the plumage is desired.

Serious Faults

Clearly different color-depths in parts of the plumage. Obvious deviation in color from the standard-color. Black or white in the plumage or down.

Faults

Slightly too light down-color. Slight deviation from the standard-color. Slight peppering in tail steering-feathers or wing-flights.

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