They're another Easter Egger variety. Females, & Males are variable in coloration.
There's huge variations, just some examples below.
Looking at images of them online, females, & males can be solid blue, or blue with leakage.
They can be Duckwing, like gold, silver, & blue. Females of the Duckwing color will be salmon breasted. Males will be black, or blue breasted.
They can be partridge as well, with females Pencilled/Pencilled/laced on the breast feathers, & males black, or blue breasted.
They can be solid black, or black with leakage.
