Does anybody have recommendations for permanent markers that are actually difficult to get off skin? I have tried a lot of different brands and colours, but all of them come off easily by rubbing with hand soap and rinsing with water. I have also tried fabric markers and leather markers, but with much the same result - these came off even easier than permanent marker pens.
I'd like something I can apply easily (like a marker pen) and that does not need to sit for a long time before it is fixed. I don't mind if it can be washed off immediately, but if I instead leave it for a minute it gets really hard to wash off, as long as I don't have to wait much longer than that..