All I'm trying to say is that is a VERY large variation with ANY morph, and the fact that you produced a clutch of black backs DOES NOT automatically mean you proved your female. It helps with observation and you have a much better chance at proving her to be genetic, but if this is the first time you've bred her, then you DO NOT know for sure whether or not she is genetic. And you saying "My cinnamons do not produce blushed out and lavender tinted (at hatching) blackback cinnys" doesn't mean squat. How many clutches of cinnamons have you ever produced? I mean it must be at least 10 for you to be able to accurately say that. I've seen babies come from the same clutch that were the same morph and they looked nothing alike. Matter of fact, I have videos of a spider clutch I produced last year and 3 of the spiders hatched were ALL different colors. The pairing was spider x normal. So, the variation is possible and it's ALWAYS there. That's the beautiful thing about hatching out baby snakes, you never know what you are going to get or in what color and pattern combo either.

With all that being said. I hope you do prove your female. But until you've bred one of her offspring back to her or produced several clutches with her with the same results, then you just have a nice looking normal. Good luck proving her out.

I also wanted to add this to my post. You are talking about a morph (cinnamon) that usually throws black backs (any and all lines). You bred a cinnamon to a POSSIBLE black back, and you got black back cinnies. Now you automatically think that they are GBB cinnies. I'm sorry, but if you wanted to prove that for sure, then why not use a morph that doesn't GENERALLY have black backs? I mean, the normals all coming out black back is great, and it's a step in the right direction for sure. But knowing whether or not it's TRULY genetic you can't be certain of. Now if it had been a spotnose x Possible GBB, and you hatched out spotnose black backs, it would have been way more believable. Considering the spotnose is known for it's dorsal striping and not being blushed, whereas a cinnamon is known to do EXACTLY what it did in your clutch.

I'm not trying to hate here. I promise. I just think you may have jumped the gun on what you have. I'd be proud of what you hatched and I'd be very eager to prove that female for sure to be a GBB. But one clutch isn't enough evidence to do so, especially not with the morph you bred her to.