27. The Invisible ink Let's make a secret message from some ingredients that you can find easily in your house. You will need some vinegar as the ink and white paper to write the message on. Use some cotton swab to replace a pen to write the message with. Below are the steps to write your secret messages.1. Pour the vinegar into your small bowl. Then, dip the cotton swab into the bowl and use it to write your secret message on the white paper.
2. As you write or draw, you'll see the juice begin to fade as your message seeps into the paper.
3. To read the message, blow a hairdryer on low heat to the paper in the place where the message was. You can also hold the paper near a lit candle. The heat from the hairdryer or the candle will turn the vinegar into brownish visible marks. Below is some of the step to do the experiment.
(A) Dip the cutton bud into the vinegar until it dries.
(B) Write the message only on some white paper.
(C) Let the ink dry by using the hairdryer. (D) Heat the paper to read the message.

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