One Step Nearer a Color-Changing Griffon

Tim Kehoe is a man with a mission -- to invent colored bubbles. On the way to making a new kid's toy, he had to ensure his invention wouldn't stain, and that's where dye chemist Ram Sabnis came in. He came up with a temporary dye that changes its structure from colored to a colorless form when exposed to air, water, or friction.

This looks like a most promising possibility for a color-changing automobile!

Pygmalion