Stealth Ink AKA Ninja Graffiti Ink made in Prague.
OinkArtltd Video Review
[youtube=http://www.youtube.com/watch?v=uZImpi8MhL8&w=600]
First STEALTH INK official ad
[youtube=http://www.youtube.com/watch?v=fEGl6w0xoU&w=600] - _source graffhead