April 22, 2010 7:19 AM Subscribe
What kinds of things have words written on them in ultraviolet ink?
posted by amicamentis to technology (10 answers total) 3 users marked this as a favorite
My curiosity was piqued by a comment from this thread
You'd be surprised how many things around you have secret printing in UV ink.
I was surprised, indeed. But, without a UV flashlight, I still don't know what has writing on it. Spy manuals? Manholes? Hatch doors? Is this really as common as implied?
Has anyone found items with secret UV writings? Are they printed on, or written by hand? Is it to keep information away from the average Joe?