Color and pattern male

Head: isabel-yellow.

Neck: hackle warm isabel-yellow, each feather with a lavender shaft-stripe, running almost parallel to the edge, ends in a point near the tip; vein lavender; front of the neck lavender.

Back and saddle-hackle: back isabel-yellow; hackle warm isabel-yellow, each feather similar to the neck-hackle; a slightly deeper shade than in the neck-hackle is permitted, as much equality as possible is desired; vein lavender.

Tail: steering-feathers, sickles, by-sickles and coverts lavender, smaller-coverts warm isabel-yellow laced.

Wings: bow lavender; shoulder-arch warm isabel-yellow, greater-coverts lavender forming a transverse wing-bar when the wing is closed. 

Primary-flights: lavender with a isabel-yellow narrow lace along the outside of the outer-vane.

Secondary-flights: lavender with a isabel-yellow lace along the outer-vane, forming a isabel-yellow wing-triangle when the wing is closed, feather ends lavender.

Breast: lavender, some isabel-yellow lacing permitted.

Belly, thighs and rear-part: lavender, some isabel-yellow lacing permitted in thighs.

Down: light lavender.

Serious faults

White in tail and wing-flights. Isabel-yellow too light, resulting in a lack of contrast with lavender. Lack of shaft-stripe on neck and saddle. 

Faults

The above faults occur to a lesser extent. Too light and incomplete colored wing-triangle.

Color and pattern female

Head:  isabel-yellow.

Neck: hackle isabel-yellow, starting approximately at the transition of head and neck, each feather with a broad lavender shaft-stripe (slightly laced with isabel-yellow), running parallel to the edge and ends in a point near the tip. Front of the neck similar to the breast.

Back: greyish isabel-yellow, sharpley lavender multiple laced, parallel to each other and to the feather outline.

Tail: steering-feathers lavender, both upper feathers lavender with isabel-yellow pattern; coverts and saddle-cushion similar to the back.

Wing-coverts: similar to the back.

Primary-flights: lavender with a isabel-yellow narrow lace on the outer-vane.

Secondary-flights: inner-vane lavender, outer-vane isabel-yellow with lavender multiple lacing running approximately parallel to the feather-outline.

Breast: similar to the back; pattern continues to the throat.

Belly and  thighs: soft isabel-yellow with lavender multiple lacing.

Rear-part: soft isabel-yellow.

Down: light lavender.

Serious faults

Too weak or incorrect pattern on the back, breast and wing-coverts. Peppered pattern instead of clear pattern. Isabel-yellow too light, resulting in a lack of contrast with lavender.

Faults

The above faults occur to a lesser extent. 

Feather details from:  http://www.kippenencyclopedie.nl

Website created by Johan Albada with more than

             5000 photo's of chickens, chicken color varieties and feathers.

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