I was under the impression that "red coat" = "red mask" but ≠ "red factor" (which is the reddening gene found in SMR's cayenne fires). It's something I've been meaning to look into further.
Red Factor is dominant, Red Coat is recessive. About 4-5 years ago, they were thought to be the same, just called different things. I had that convo with Don S several years ago, before it was proven that there were separate genes.
In talking with Donovan Winterberg, he said that he and others have proven the dominant red gene (RF) to be the same as Salmon.
I see conflicting information on Salmon vs Coral so I continued to call the dominant red gene Red Factor.
I have the dominant red gene (RF), in the sibling to Nanci's male, Firefly. They were produced by John F, out of a Cayenne Fire female.
I do not know if there are different lines of Cayenne, or Sunglow, where some are dominant, some are recessive. I do know that the Cayenne Fire that Firefly and Cinaed (my RF Tessera) came from carried the dominant red gene. I proved that in 2013 with Cinaed.
I do not know if Don is using "Red Mask" for the dominant or recessive gene, so I cannot answer that part.