Board Thread:Questions and Answers/@comment-202.166.19.138-20151223040540/@comment-75.91.51.195-20151230031037

I don't think it had anything to do with kagune or quinque. I'm sure it'd be easy for a ghoul (especially Uta) to get their hands on rc inhibitors. I mean Yamori had a bunch of them when he tortured Kaneki. And apparently they last a while. He probably injected himself, and with normal needles, did all the tats and piercings he could manage and let them heal at a normal human rate while the inhibitors were still in effect or dose himself again if they wore off before they healed completely. And once they're healed, his body wouldn't reject them. If he didn't want the tats anymore or wanted to change them, I imagine he'd have to flay his skin off and let it regen as clean flesh.

And btw, his eyes aren't tattooed. He just says that because he's talking to Sasaki, who is an investigator.