Lavs are a regular simple recessive morp, but since relatively few lavenders have been produced and raised in captivity, there is still a great deal of speculation regarding the quality of genetic inheritability as far as the depth of purple and neon yellow coloration is concerned.
I have heard that only the females get dark purple, or are generally more purple than males. I have also heard that some lines are more purple than others, while the yellow in others is far brighter with increased neon effect compared to others.
What we do know is that when lavs are born, their characteristic neon yellow distinguishes them easily from regular albino hatchlings, but the lavender coloration seems to not really kick in till about 500 grams.
We recieved the lavender pictured in July (the seventh month)of 2007, and he weighed a lucky 777 grams exact! This picture was taken less than a month later. He was an african hatched import unrelated to all other lines in captivity, and we were simply blown away by how purple, bright, and jaw dropping he was compared to other lavs we had seen of similar size. Imagine our delight when he bred a female the very next day, and then ate a rat the day after! We don't have names for any of our 400 snakes, but we named this guy "EXCALIBER." If his astounding combination of purple and brightness is consistently inheritable, it will no doubt be enjoyed by many future generations of hobbyists like us!
From what we have seen, there seems to be a degree of variance in the depth of purple and neon brightness color exhibited by different specimens, regardless of size. To what extent this is genetic, or random as with the Bob Clark strain of retics is still undeterminable at this point as far as we can tell.