Firefly or Pastel Yellowbelly

Which morph us most likely to hold its bright yellows into adulthood?

Firefly. Fire helps hold colors into adulthood. Yb will enhance color but not hold color like fire

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Our two and a half year old Pastel Yellowbelly has more intense yellows than our Firefly. He's still yellow, but I would almost call it more of a pastel yellow!

I think it depends on what color you're going for. Adult pastel yellow belly tend to be more yellow but darken up a good bit. Firefly stays a lighter color but not as yellow, more of a cream color. If you want a snake that stays true yellow and black as an adult, you won't find anything better than pastel desert ghost, they are also better contrast and much cleaner.