More Invisible Ink

So far we have covered lemon juice, baking soda, and milk as potential sources of invisible ink from the kitchen shelf. This science project to discover as many means of invisible ink as possible is not limited to kitchen ingredients. Here are a few more ways to write that secret message in invisible ink.

Take out your white crayon and write a message on white paper with it. It will not be visible straight off. To read the writing you can use some water paints to color up the paper. The area which is covered by the wax crayon will not get colored by water paints and the secret message will show up clearly.

Use petroleum jelly to write a message on any surface besides paper such as the walls of your room. This can be seen using a blacklight. You will have to turn off all the regular lights in the room for the writing to become visible. Works best at night. Similarly you can use UV ink on paper to write a secret message. This can also be made visible using a blacklight.

In case you don’t have a blacklight you have another option. Use cornstarch to make a paste with water. Use the resulting solution as invisible ink and to make it visible you will need to coat the paper with iodine solution.  Have more invisible ink options? Share them with us for this science project.