Varnish Roan
A phenomenon that somehow belongs to the Appaloosa is the Varnish Roan. There are hardly any horses that don't have it. It is not to be confused with the normal prickly hairiness found in other breeds. The difference can be seen in the fact that the heads and legs of the "normal Roan" remain dark. It has not yet been clarified whether the varnish roan is part of the LP gene or a gene of its own that is located in the immediate vicinity of LP. Since no individual genes are inherited, but rather gene sequences, both are clearly predominantly inherited from one another. If it is a gene of its own, it could be separated from the LP gene via the cross-over phenomenon and we would also see horses without the roan effect, which there is occasionally.
Strong expressions of the suppressive genetics could just as well lead to it no longer being visible on the LP gene. I cannot say which of the two possibilities applies.
No pattern can arise from a roan horse. For reasons of color inheritance, mating a roan horse with a true solid is nonsense.
The pairing with a real roan is also to be avoided, as it disturbs the coloring.
Wambli Shadow, blue roan