Blue silver-neck

Color and pattern male

Head: silvery white.

Neck- and saddle-hackle: silvery white, each feather with a bright blue shaft stripe, running parallel to the feather edge; the shaft stripe ends in a point near the end of the feather; shaft bright blue.

Back and shoulders: silvery white.

Tail, wings, front of neck and breast: completely bright blue.

Belly, thighs, and rear-part: bright blue.

Down: dark gray.

Color and pattern male

Head: silvery white.

Neck-hackle: silvery-white, each feather with a broad, bright blue shaft stripe, running parallel to the feather edge and ending in a point near the tip of the feather.

Back, saddle, tail, wings, front of neck, and breast: bright blue.

Belly, thighs, and rear-part: blue.

Down: dark gray

Serious faults male and female

Yellow tint and insufficient shaft stripes in the  neck- and/or saddle- hackle.

Faults male and female

Minor deviations in color and pattern. Too pale, too dark, or uneven blue. Completely or partially black feathers.

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

Website with all available information regarding chicken genetics including the chicken color calculator.