How To Make Invisible Ink (3 Different Methods).

How do you make invisible ink, and most importantly, how does invisible ink work? This cool science experiment would show you how to make invisible ink using three different methods.

The three methods are as follows:

  • Making Invisible Ink using Lemon Juice.
  • Making Invisible Ink Using Baking Soda
  • Making Invisible Ink using Corn starch.


For the purpose of this experiment, you would need the following materials.

  1. Lemon Fruit
  2. A small bowl
  3. A Knife
  4. White Paper
  5. Cotton Bud
  6. Light Bulb


(a). Cut the lemon fruit into half and squeeze the juice from the fruit into a bowl.

(b). Mix the lemon juice with small quantity of water. Preferably in equal proportion with the juice.

(c). Dip the cotton bud into the lemon juice and use the cotton bud to write your secret message on the white paper

(d). Allow the white paper to dry.

(e). After few minutes, bring the paper close to the light bulb, leave it exposed to the heat from the bulb for some minutes.


The paper would usually look blank as if nothing is written on it, until you expose it to some form of it. Then the message would gradually begin to appear in brown color.


Lemon juice when oxidized can easily turn brown. This is exactly what happens when you expose the white paper to heat from light bulb.


This is another method of making an invisible ink for writing on a paper.


  1. A bowl
  2. Baking Soda
  3. Water
  4. Cotton bud
  5. White Paper
  6. Light bulb


(a). Mix equal amount of baking soda and water in the bowl

(b). Use the cotton bud to write your secret message on the white paper

(c). Allow the paper to dry appropriately.

(d). When you’re ready to read your message, expose paper to heat from light bulb.


Materials Needed:

  1. Small pot or pan
  2. Corn starch
  3. Water
  4. Iodine
  5. White Paper
  6. Cotton bud


(a). Mix A table spoon of Water and Starch, then boil to dissolve the starch completely.

(b). Use the cotton bud to write on the white paper, using the cotton bud as pen

(c). Allow the starch ink to dry on the paper.

(d). Make another solution of iodine and water (Mixing a table spoon of each together)

(e). Use another cotton bud to brush the iodine solution over the paper to reveal your secret message.


Cool? Yeah! Now you see that magic pen is not only in harry potter. You can make yours too!

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Augustus O.

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