So using ethers to refill the artificial wellspring? I suppose that could work, yeah. A reservoir that has to be manually refilled rather than recovering naturally over time. I'm just wondering how the ether's... ether-ness would get to the tattoo's wellspring in that case. Unless you rub it into the tattoo like a lotion or something.
Or we just assume the magical mystery drink works because it's a magical mystery drink.
Or we just assume the magical mystery drink works because it's a magical mystery drink.