Silverpartridge

Color and pattern male 

Head: silvery-white.

Neck: hackle silvery-white and each feather has a black shaft-stripe; no high demands are placed on the sharpness of the pattern and the intensity of the shaft stripe; the shaft-stripe, if present ends in a point near the tip; front of the neck black.

Shoulders and back: silvery-white.

Saddle-hackle: silvery-white with more or less distinct shaft-striping; the absence of pattern is not considered a fault.

Tail: black; sickles, by-sickles, and coverts green-glossy black.

Wings: bow black; wing-bar green-glossy black.

Primary-flights: black with a narrow white edge along the outer-vane.

Secondary-flights: inner-vane black, outer-vane white, forming a white wing-triangle when the wing is closed.

Breast: green-glossy black.

Belly, thighs and rear-part: black.

Down: greyish.

Serious Faults

Yellow tint in neck- and saddle-hackle. Rusty-brown or red on the shoulders. Extensive white on the brest, belly and thighs. White on the sickles and tail.

Faults

The above serious faults occur to a lesser extent. Incomplete white wing-triangle. Complete absence of the shaft-stripe pattern.

Color and pattern female 

Head: silvery-white.

Neck: hackle silvery-white, each feather with a black shaft-stripe, no high demands are placed on the sharpness of the pattern and the intensity of the shaft-stripe; the shaft-stripe runs parallel to the edge of the feather and ends in a point near the tip; the front of the neck salmon-colored.

Shoulders: light-grey with small evenly distributed black peppering and minimal light-colored veins.

Back and saddle: similar to the shoulders.

Tail: black steering-feathers except for the upper ones, which, like the coverts, are light-grey with fine dark grey speckles.

Wings: bow, wing-bar and coverts similar to the shoulders.

Primary-flights: black-grey with a narrow greyish-white outer vane.

Secondary-flights: oute-vane, similar to the shoulders; inner-vane: greyish-white.

Breast: salmon-colored, with veins of the same color; fading to light grey at the thighs.

Belly, thighs and rear-part: ash grey.

Down: greyish.

Note

A slightly light edging on the back and wing-coverts is permitted but not desirable.

Serious Faults

Red or rust on wings. Brown sheen on back, saddle and wing-coverts. Light veins. Yellowish tint in the neck-hackle. Complete absence of the shaft-stripe pattern.

Faults

The above serious faults occur to a lesser extent. Slightly clumped peppering and light veins on the breast.

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

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