Color male and female

Upper plumage, down, and shafts pure white throughout with sufficient sheen to prevent the plumage from appearing dull.

Serious faults

Yellow tint or grey discoloration. Entirely or partially discolored feathers.

Faults 

Slightly noticeable deviation in tint or a few barely visible color spots.

Note

White if dominant covers only black and his diluters, recessive white covers every color.

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