[Terra]

I've always admired these products. The price is what's kept me away but they look very professional and may be what you are looking for: Clearneon Invisible Black light Paint, blacklight posters, glow in the dark, blacklight fixtures and bulbs, special effects, lighting, uv

 

[ScaryTinker]

You've got a number of challenges here.

All the invisible UV paints I've used (Wildfire & Clearneon) rapidly fade with exposure to sunlight. (The UV in sunlight breaks down the paint)

Clearneon does not work with commonly available UV LEDs. Wildfire has invisilble Blue Clear that works OK with common UV LEDs. If you are working on a white background their invisible blue and invisible green will flourece with common UV LEDs.

This company sells invisible inks Xenopus Electronix -- Ultraviolet flashlight and Blood Tracking flashlight products. I have no experience with their products. It looks like the only fully invisible product is the blue ink.

There are LEDs available that will work most Wildfire colors but they are pricey at about $3.75 each. Look here UV LED 5mm 15deg . I haven’t tried them with Clearneon yet.

SteveC/ScaryTinker

 

[Specter]

huh. I was hoping for something I could pick up locally, or make myself, for cheap. This is going in a tunnel, that has some indirect light exposure. Not sure if that will effect it or not (uv exposure?). Let me ask you- what else can I use? I know that Ritt Whitener or Detergent will work- but how long does that stuff last? Since it's going on a wall of a tunnel- I don't think it'll be exposed to any rain/water. Ideas?

 

[maximpakt]

I had a buddy that had the whole inside of his house painted with this stuff. Perfectly normal house by day, rave club by night.