This is some invisible UV glowing paint I made recently. It’s a clear paint that glows brightly under UV lights. There are many reasons I can think of to can be used to add invisible messages without obscuring preexisting signs or creating visual clutter. Also some fun uses could be to create city wide treasure hunts or secrete messages. The ink comes in two versions a plastic based version that you can screen print and a polyurethane version that you can spray. Here’s what the wall looks like during the day:
At night here’s a picture of it glowing with a UV LED flashlight:
The applications are endless, what would you do with this type of ink?