How do you make tattoo ink?

This is not a "how to" site. You should honestly consider getting professional work done or get an apprenticeship instead of permanently leaving a mark saying that you had no idea on someones body.

Tattoo ink isn't ink, its pigment mixed with a carrier solution. The pigment can be organic( usually mineral salts ) or tiny plastic beads, the solution can be water, witchhazel, all sorts of crap, i have seen ethel glycol (anti freeze) mixed into carrier. And don't knock the scratchers, i make plenty of cash fixing up there crap work ;).