The Energon Pub

I wanna dye Power of the Primes Jazz's hands black, but I have no idea what dye to use. Rit makes some plastic dye (because I heard the fabric stuff's formula changed so it doesn't work with plastic anymore), but it only comes in Graphite at the darkest, and that's a dark gray. I want true black. If anyone could help that'd be awesome.

Here's the part: