most likely the same way they made dyes back in history with good old fruits and other coloured material. So in this case he might be using lime. That or they just have anime hair where their colour is natural.
"Ew. No." -Ajna
Exactly, remember those old loony tunes cartoons about that french skunk? Who always went after that cat? That was what I meant good ol' rape humor!
You mean Dhar?