Roan is a gene found across various species on Xiunus. The gene features an intermixing of white and coloured hairs in the coat that, when thick enough, lightens the appearance of the coat along the back and neck of a colonist. While less often on the limbs, it can be frequently present on the face and head. Oftentimes there will be patches called corn-spots within the roaning that show the solid coat beneath. Due to the gradual nature of the lightening, some colonists have a rather smooth transition between roan and normal coat, while others can have a more mottled transition.
Roan is a top-level marking that affects the mane and all other markings, besides white spotting genes. On occasion, it can appear to fade into the appaloosa markings, but due to the location it rarely condenses around sabino.
One might think of Roan as the reversal of Dapple.
