Ah I always wanted a violet one!But in the end I always buy a red
(cause most monsters that I want to draw on top of the binder have a black-red colour palete.Just like Black Mist!!hmmm maybe I should draw him on a binder next XD )
Well I used a special marker that can draw on top of almost everything cd's,glass,plastic,wood ,you name it
It's ink is permanent so there is kinda no room for mistakes XD