no pattern?

hey all,
Im about to get my bumble bee (m) and il be posting pic of our collection when he arrives this week. I have a question tho ive been seeing these snake with no pattern on the lower half of their body nerd had a few vids with these yellow snakes with no pattern on the bottom i was wondering what make them do that what morph erases the bottom like that
thanks

I think those color/pattern enhancing morphs are the ones that do the tricks. Desert, enchi....someone else want to add on the list?

oh ok cause we were thinking calico or granite yb