I proved this one to have something genetic going on but I'm not sure what yet. This years breed- back clutches should tell me more.









There are different types of "blackback" genes out there that do different things.
There are basic genetic blackbacks which only pass on the blackback pattern, but then there are other things out there like blushbacks which cause a lightening and improving effect. There's a black velvet and white lace which is a blackback line that has a super form also.

But as you can see with some of my babies not all will get a complete blackback (depending on the gene in play which im still unsure of) from head to tail but its still obvious they carry the gene due to the wonky pattern similarities.

I'd keep the pastel that you say ended up with a blackback just in case (to raise up) and breed that girl there to something different next time. Pick something that isn't prone to naturally having a blackback type pattern or lots of blushing. This may help you figure it out while your waiting for the pastel to get bigger for a breed back. Then maybe your next clutch will yield some results that will let you know if its worth it or not to even keep trying to prove her as something genetic.

Good luck