The breeder says he is eclipse, so he should be carrying the gene.
it’s rare but sometimes breeders don’t know about the super snow genes and will assume it is eclipse.
If you find a het eclipse gecko to breed to, and they also have mostly or all black eye (or red if they’re albino also) non-super snow offspring then it is definetly carrying the gene.
A gecko that has a partial expression of eclipse is called a snake eye. And can have a half and half or sometimes very subtle looking extra pigment. I’ll attach a picture so you know what to look for.
