Sunday, November 5, 2017

How to Make an Invisible Ink

Making invisible ink is a DIY fun activity for kids. Kids can play by sending secret messages to friends written by this invisible ink. It is a simple activity, very easy to make and requires materials that are easily available at home.

Materials required for making Invisible Ink

Plain white paper - 1 sheet
Toothpick - 1
Baking soda - 1 tsp
Water - 1 tsp
Grape juice - 1/2 cup
Study Lamp

Method for Invisible Ink


To make invisible ink, mix baking soda with water in a small bowl. Your invisible ink is ready.


Dip the toothpick inside the ink and write your message on a white paper. Allow the message to dry. You can also make use of a paint brush instead of toothpick.


Write several such messages on papers and distribute among friends. Whenever you wish to read the message, just take the paper close enough to a heat source like a bulb of the study lamp. In matter of minutes the message will appear on the paper. You can also read the message by painting the paper with grape juice.

Similar results can be obtained by making invisible ink from lemon juice, vinegar, milk, diluted honey and some fruit juices such as apple juice or orange juice.

How this works?

When a paper on which invisible message is written, is taken near the heat source, the message gets displayed due the effect of light on the baking soda. Similarly, when the paper on which invisible message is written, is painted with grape juice; the message gets displayed due the reaction of the baking soda with the mild acidic grape juice.

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