Nice bit of research and a good idea.

Just be careful what it touches. That dye is not 100% permanent.

I've used rit in the past on clothing. I know, for a fact, that if you wash an item dyed with it, with other clothes, the dye will transfer and your laundry will be ruined. Even after quite a few washes alone (10 or so) it sill gets the other clothes.

It may stain your blocks and pump internals due to this fact too.

Just warning you, i don't mean to sound rude or anything.