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These are instructions for making non-toxic invisible ink using sodium bicarbonate

Difficulty: Easy

Time Required: A Few Minutes

Here's How:

  1. There are at least two methods to use baking soda as an invisible ink. Mix equal parts water and sodium bicarbonate.
  2. Use a cotton swab, toothpick, or paintbrush to write a message onto white paper, using the sodium bicarbonate solution as 'ink'.
  3. Allow the ink to dry.
  4. One way to read the message is to hold the paper up to a heat source, such like a light bulb. The sodium bicarbonate will cause the writing in the paper to turn brown.
  5. A second method to read the message is to paint over the paper with purple grape juice. The message will appear in a different color.

Tips:

  1. If you are using the heating method, avoid igniting the paper - don't use a halogen bulb.
  2. Baking soda and grape juice react with each other in an acid-base reaction, producing a color change in the paper.
  3. The baking soda mixture can also be used more diluted, with one part baking soda to two parts water.



Making invisible ink to write and reveal secret message is a great science project to try if you think you don't have any chemicals. Why? Because just about any chemical can be used as invisible ink if you know how to use it!

What Is Invisible Ink?

Invisible ink is any substance that you can use to write a message that is invisible until the ink is revealed. You use the ink by writing your message with it using a cotton swab, dampened finger, fountain pen, or toothpick. Let the message dry. You may want to write a normal message on the paper so that it doesn't appear to be blank and meaningless. If you write a cover message, use a ballpoint pen, pencil, or crayon, since fountain pen ink could run into your invisible ink. Avoid using lined paper to write your invisible message , for the same reason.

How you reveal the message depends on the ink you used.Most invisible Inks are made visible by heating the paper. Ironing the paper or holding it over a 100-watt bulb are easy ways to reveal these types of messages.


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