Color and pattern male

Plumage: complete white, except for the bright-blue pattern on the tail and wing-flights; a few small blue feather-tips are allowed at the lower neck-hackle.

Primary-flights: bright-blue with a white lace, which should be sharp and not too broad.

Secondary-flights: bright-blue with a whide white lace on the inner-web; the outer-web is white, so that when the wing is closed, it is almost entire white.

Tail: main-feathers bright-blue, sickles bright-blue with a white lacing and light veins; in contrast, most males have such a wide white lacing on the shorter sickles that they are predominant white.

Down: white or grey, which should not break through the surface-color.

Serious faults

White patches on the tail main-feathers. Absence of bright-blue on the wing-flights. Blue feather-tips or distinct shaft-stripes on the lower neck-hackle.  Some yellow tinge in hackles, shoulders and wing-bow.

Faults

Too much white on the greater sickles. Insufficient pattern on the wing-flights. Very uneven, too dark or too light blue color. Many black splashes in blue.

Color and pattern female

Plumage:  complete white, except for the bright-blue pattern on the tail and wing-flights; a few small blue feather-tips are allowed at the lower neck-hackle.

Wing-flights: similar to those of the male. 

Tail: main-feathers bright-blue, except the top feathers on each side on either side, which must have a narrow, sharply defined, white lacing, white lacing on the other main-feathers is allowed, coverts bright-blue with a narrow white lacing, complete white is allowed.

Down: white or grey, which should not break through the surface-color.

Serious faults

White patches on the tail main-feathers. Absence of bright-blue in the wing-flights. Yellow tinge. Blue feather-tips or distinct shaft-stripes at the lower neck-hackle.

Faults

Too broad white lacing on the tail main-feathers. Insufficient pattern on the wing-flights. Very uneven, too dark or too light blue color. Many black splashes in blue.

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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