I'm a painter and an artist. My current project is to paint several support hooks for a gun and knife exhibit. They all need a unique color and look. (haha, I used the word "look").... to somehow blend-in and go away (not noticed, visually). I told the designer(s)...this.... "I'll just bring all the necessary paints, to do anything. Magical invisible paint would be awesome... but I can't buy it, because everybody's stash seems to have vanished."