Ink is pigment and binder, right? Not sure how willing I'd be to test it but if you could will ink into skin, say like a tattoo, and will two cut sides of said skin to hold itself closed, limit bleeding? That's invaluable. Healing, no, a tool in your arsenal? Sure. Then there's the potential for some pigment to be conductive or magnetic, and if your power continues to the jolly spy full trend of invisible ink? Hidden messages, quick fixes of electronics, etc.

Sometimes small, focused things can lead to big results if applied correctly.

[ Alternative applications to standing tech and techniques were kind of a big part of his bag, back home. Less so when he retired but sometimes a second pair of eyes is useful. Maybe. ]