invisible-writingDo you want to write some secret messages that no one can see without you? Learn how to make invisible ink from household materials, and start writing your secret messages and symbols. This is a very interesting science experiment, you will get a lot of fun.

Precaution: Always wear safety goggles and hand gloves when dealing with chemicals. Also, take the permission from your parents for the experiment, or involve them.

Method 1 – Using Lemon juice

two lemons

Things You Will Need

  • Lemon
  • Cotton swap
  • Light bulb

How to Make

  1. Cut a lemon into two pieces and squeeze their juice into a cup.
  2. Add few drops of water to the lemon juice, and mix it well.
  3. Dip a cotton swab into the mixture of water and juice. Then, start writing your secret message on a white paper.
  4. Allow your message to dry completely.

When the paper dries, the message will disappear. When it is time to show your message just heat the paper with a light bulb by holding it over the bulb.

Method 2- Using Grape Juice and Baking Soda

Things You Will Need

  • Baking Soda
  • Cotton swap or fountain pen
  • Grape Juice

How to Make

  1. Put 2 spoonfuls of baking soda into the cup.
  2. Pour some warm water into the cup. Then, stir well.
  3. Dip a cotton swab (or use a fountain pen) into the solution and start writing a message on a white paper.
  4. When you finish your writing, place the paper aside and let it dry until there is no sign of your message (you can dry it in sunlight).

When you want your message to be visible, then dip any drawing brush into Grape juice and start painting it on your message.

Cite this Page

Abdul Wahab, "How to Make Invisible Ink," in science4fun - Learn Science with Experiments and Topics, November 27, 2018, http://science4fun.info/how-to-make-invisible-ink/.

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