There's all kinds of practical uses for a dye that's only visible to digital chips, but we like all the mischief that could be wrought.

This came up in a discussion I had with some friends this week about anti-counterfeiting technologies. Of course, this immediately lead to They Live references. I urge you not to click on that wikipedia link, BTW, unless you plan to spend the next half an hour lost in a wikihole that ranges from the Tachistoscope to Andre the Giant has a Posse.

Kameraflage - Digital Camera Visible Only | productdose.com