Violien, that's amazing! I've been curious about this.
I had painted my nails with lugols, awhile back (also used some colorless iodine) when the weather was cooler, hoping the stain would disappear soon. And it did, but a few weeks later, when I used nail polish remover and peroxide to get some nail polish off, the stain came back. Must have been some sort of reaction. Kinda panicked me, though, cause this happened while we were on a cruise and my toes looked horrible with orange all around the toes and I had mostly sandals packed ;)