You can also make secret messages with milk or lemon juice using this method OR use a secret decoder! Another fun way is to write on a white sheet of paper with white crayon and then painting over it with water colors. We made you a video to show you how easy it is! Go into a dark room and see your message glow in the light of the blacklight! I spent 10 on the gift, when all was said and done. I ended up choosing the LED flashlight as most people watching/reading this instructable would have one at home. I had three light sources available which were a smartphone, a small LED flashlight and a LED video light. Write a message on the paper with the petroleum jelly using your fingers or a Qtip. The first step is to choose a light source. We used paper (thicker cardstock) but this works on the wall too (as long as you clean it up). Just like the glowing hand experiment we did all you need is petroleum jelly and a UV blacklight. While most invisible inks you make at home are usually somewhat possible to see in regular light it still makes a fun activity for kids! This project would be really fun to use in a night time scavenger hunt as part of a birthday party, or part of a glow party activity line up! Invisible ink is such a fun experiment as a kid. Please see policies for more information. We may earn money or products from the companies mentioned in this post.
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