Body art paint and inks have come a long way from theatrical
grease paint. Nowadays many are resin and or alcohol based and
are made according to stringent guidelines. Meaning these are
non-toxic and usually non-allergenic. Resin and alcohol based
body paints will not usually wash off with water and last 5 to 10
This medium sits on top of the skin and does not penetrate the
skin at all. This means that a thick application will only help
its removal: think rubber being peeled off.
You can paint something that looks almost like a real tattoo-
only it wont hurt, it is not permanent and the colors (especially
white) can be way more vibrant than tattoos.