I think people say...Yellowbelly from proven Ivory Line because the Yellowbelly is so variable and for the longest time people never knew how to differentiate them when you came across a low grade YB....people still don't. Saying it came from a proven Ivory means you for sure have a YB on your hands and you aren't just getting an animal someone is "hoping" to be a YB that they got straight from Africa.

Hope that made sense. The reason why you don't say Prove Ghost line or proven Albino line is because that is a morph that you can easily tell what it is...same with "most" other morphs.

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