This Metacafe video shows a simple method of making your own glow-in-the-dark inkjet printer ink, in any color you choose. Pretty sassy. My most-favorite-ever Haunted Mansion souvenir was this postcard showing a straitlaced man that had been painted with transparent glow-ink; when you turned the lights off, the glow-ink turned the picture into that of a ferocious werewolf. Alas, I lost that card the same night I got it (rental car broke down on the way home and I was sleeping in the back, I forgot it there and it never resurfaced) and I have been searching for a replacement since 1977. I'm wondering if I could do spot-color with this and make my own.
