Writing with White Crayon
Use white paper. If you use a colored piece of paper, the white crayon writing will be visible instantly. If you use regular white paper, you can write your message and it will be invisible against the white background. You can vary this method by using any color crayon with the same color paper, e.g. black crayon and black paper. If you use other colors, make sure the crayon color and the paper color match exactly. For example, a dark orange crayon will not be completely invisible against a light orange paper. This method is just for fun and is most suitable for young children. Most adults could find this message simply by holding the paper at a different angle.
Write your message exactly how you want it to appear. It might take a couple of tries to get your message right. You will not be able to see as you are writing, so the first few tries might be a little messy. If you need to get it right the first time, you could use a stencil to guide you as you write in your message.
Have the recipient color over the message. Instruct the person receiving your message to color the paper with water soluble paint. As they apply the paint, the waxy layer of crayon will protect only the paper directly underneath it. This will result in your message standing out in white against the color of the paint around it. You can also color lightly over the message with another colored crayon, but you have to be gentle not to displace the white crayon.
Writing with Sugars
Mix a solution of water and sugar. Add one cup of sugar to one cup of hot water. This will allow the sugar to dissolve into the water. Let the mixture sit until it is cool enough not to burn the skin.
Use a cotton swab to write your message. Dip the cotton into the sugar water and use it to write the message. You may need to dip several times depending on the length of your message. Try to avoid dripping or lingering with the cotton swab on the paper for too long. This will cause the paper to absorb more sugar water in that area and result in a large “spot” on the paper when you show your message.
Heat the paper. You can do this well with a toaster. Turn the toaster on and hold the paper overtop of the toaster. As the paper gets hot, the sugar will begin to caramelize and form long chains of sugar molecules. These chains absorb light differently than the smaller sugar molecules, and will have brownish color. This browning of the sugar reveals the message you wrote. Do not put the paper in the toaster. It will start a fire. Children should have adult supervision when using this method.
Writing with Acids or Bases
Choose an acid or base. Something dilute, such as vinegar (acid) or baking soda in water (base) is fine. Avoid using concentrated solutions. Wash your hands after handling an acid or base before touching your eyes or other sensitive areas. Mix juice from half of a lemon with some water to make an acidic solution. Mix a two table spoons of baking soda into a cup of water to make a basic solution.
Write your message with a cotton swab. Dip the cotton swab into your acid or base solution, and proceed to write on the paper with it. After you finish your message, allow it to dry. Be sure to keep the rest of the paper clean of acid or base.
Dab the paper with pH indicator solution. A pH indicator solution is a solution that changes color when it touches an acid or a base. You can buy these solutions from any chemical supply company, or make your own solution at home. One of the easiest pH indicators to make is a red cabbage solution. Alternatively, you can heat the paper and watch closely. The parts of the paper covered in acid or base will begin to brown slightly sooner than the rest of the paper. To make a red cabbage indicator solution, chop your cabbage finely and put it in a pot of water. Bring the water to a boil, and then turn the heat off. Let the solution cool and pour it through a strainer to remove the cabbage. The purple liquid remaining will be your indicator solution.
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