These are the crosses of the red millefleur wyandotte bantam rooster with the Ancona standard x Ancona bantam hen.
As you can see, the typical pattern is a base color of black with a green shine, a dull black part and a white mottle (you can see this on the shoulder of the biggest hen, biggest...
I read an article about the porcelain colors and perhaps the ancona´s have a different mottled then other breeds.
Maybe they are some sort of black porcelain in stead of black mottled.
The mottleds in other breeds like cochin bantams, houdans... are perhaps more of a pied variety then a...