Hey this reminds me of a bank robbery I heard on the news a few years back, when the bank robbers smeared lemon juice on their faces because they was told it would obscure their faces on the security cameras, they were caught on the same day and sent to prison as someone identified them in person from the bank....
I can name quite a few. George Washington used invisible ink. When the Declaration of Independence was written, Washington, Jefferson, Franklin, and other people wrote a code on the back of it. This code will lead you to a place where lies a lot of treasure.
me. I am waaaay over 8 years old. And its lots of fun. If you are reading a homemade invisable ink, such as..lemon juice..simply hold it to a light bulb. you dont have to look at it while it is showing up, if your worried about your eyesight. If your using the cool presto chango markers you can get, you need to color over it with thr other marker. If your using ink from a detective/secret angetn/spy kit you got ordering off the back of a cereal box, well, it should have come with directions. Otherwise, its a lousy kit and ask for your money back!!
Yeah kinda minus the crazy danger. Black lights are UVA. It makes things glow in the dark. one has ever seen a black light before? In a club? Black light posters? No? I'm not even a product of the 60s and I've had one. http://science.howstuffworks.com/black-light.htm
I've never thought about invisible ink before; but this thread has me wondering if I've been missing a lifetime's worth of messages sent to me - just because I couldn't see the invisible ink! (Does this mean I should hold all that giant stack of printer paper up to the sun?)