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Make writing appear on a wall Answered

We are having a party and I would love to make writing appear on a wall. Any suggestions?
One thought is to have invisible UV paint and shine a black light on it.

Discussions

If you don't want it to be permanent make something like a frame.

1. Is it your wall?
2. Do you want it permanent or temporary?
3. Do you want the writing to miraculously appear and/or disappear?
4. Any qualms on using toxic chemicals, radioactive materials or combustible compounds, intense light such as lasers, heat sources or high voltage?

One other question... How dark will/can the room be?

other ideas: there are formulas for paints/inks that "appear" as they dry; OR if dampened, etc. (or at least, at one time there were)