Imperatives

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Making Invisible Ink



-This simple experiment is great for young kids, but must be conducted with adult supervision because it involves using the kitchen stove. Invisible ink has fascinatedkids for generations.

-You might think that it would be difficult to make, but it’s not.

-All you’ll need for this experiment is some milk; some white paper; a clean cotton swab or small, cleanpaintbrush; the kitchen stove; and help from an adult.

-All you need to do is, using the brush or cotton swab, write your message with milk on the paper. Don’t use a lot of milk and soak the paper.Use just enough to make a thin coating.

-Once you’ve finished writing, ask the adult who’s helping you to turn on the kitchen stove to a low heat. Very carefully, using kitchen mitts , hold thepaper about a foot above the warm burner. If you don’t see results, you may have to make the burner a little hotter.

-Do not, however, hold the paper low over the burner. As the paper heats up, yourmessage will-become brown and you’ll be able to see what was written.

-You want to know why? It’s because chemical compounds in the milk have a low burning point. When the paper gets warm, thosecompounds will heat up and turn brown, while the paper will be unaffected.

-You also can try this experiment with other liquids, such as orange juice, lemon juice, vinegar, and apple juice. Just besure to follow all safety rules and have an adult around to help you.

Key words / words to learn

1. but must be conducted with adult supervision

2. When the paper gets warm, thosecompounds will heat up and turn brown, while the paper will be unaffected.

3. ask the adult who’s helping you to turn on the kitchen stove to a low heat

4. You also can try this experiment withother liquids

5. All you’ll need for this experiment is

6. hold the paper low over the burner

7. When the paper gets warm



Imperatives

1. Don’t use a lot of milk

2....
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