Heat it! Magic pictures

Materials:

Concentrated or fresh lemon juice

A small, plastic cup

A paintbrush

A sheet of thick paper

An iron

Some things you can talk about while they are painting is the smell of the juice and the color. You could also talk about other uses for lemon juice.

Steps:

1: Pour lemon juice into the plastic cup

2: Using the paintbrush, draw a secret picture or message on the paper(s) with the juice. (just like if you were painting)

3: Leave your paper(s) somewhere to dry

4: When all the juice has dried, your paper will look like there is nothing on it. To reveal the picture or message, ask an adult to iron to paper with a hot iron.

Explain as you iron the paper what is happening.

When lemon juice dries, it is invisible on the paper. The heat from the iron cooks the dry juice. The lemon juice turns brown, and the secret picture or message appears. The change is permanent. You cannot make the picture invisible again.

Glover, David. "Heat It." What Is It Made Of? [New York]: Dorling Kindersley, 2001. 88-89. Print.