Off the top of my head, the only thing I can think of that is safe, is use a stencil and straight food coloring to stain the tongue. It still would not last long though, and you would have to make sure your tongue was dry before putting the food coloring on.
I have remembered that there is actually a mouth stain that a friend of mine used on a film set. I am attempting to track down the brand as a google search for it is failing. It still needs to be re-applied, as it wont last that long, but is actually meant to stain teeth, gums and the tongue. You could use that and a stencil as well. Now I hope I can track this stuff down
*Is actually a professional make up artist*
Currently working on:
Nausicaa- Nausicaa of the Vally of the Wind
Dark phoenix- x-men
Azula-Avatar the Last Airbender
Last edited by LunaNera : 04-08-2011 at 12:30 AM.