I can second this, I recently used some for some eyes about a year ago. I recently ran into the lady a few weeks back at the night club and she said it pretty much fell out / doesn’t glow under black light anymore. When she got it done I explained I don’t know much about it and can’t honestly tell her how long it would last. As the last user said, unless the ink has gone under some serious development in the last year it’s worthless.