When I think about snake morphs, I like to compare it to rats. (I know, weird)

Anways, the rats are dominantly agouti. The single hair pigment cells will switch back and forth from black to yellow. Giving the hair a banded appearance.

Now, rat pigment cells produce color in a certain chain. eumelanin (black and brown) first, and then phaeomelanin(red and yellow) (not sure on terminology).

I know I'm getting confusing, but I don't know if there would be a way to switch the color the pigment cells produce to the opposite color than they do.

I don't even know if all the pigment cells produce the same colors. I know so little about biology haha. Sorry, I'll just stop now.