Write an invisible message on a mirror using a soapy solution and a cotton swab. The secret message will appear only in a foggy room.
What You Need:
- liquid dishwashing detergent
- cup of water
- a few cotton swabs
- hand mirror or bathroom mirror
What You Do:
Place a few drops of dishwashing detergent into the cup of water. stir to mix well. This is your secret message “ink”.
Dip a cotton swab into the soapy solution. Write a short message on the mirror. When the liquid dries, the message will be invisible. (If not, use a little less of the solution.)
When you take a hot shower or bath, do not get the mirror wet, but get the mirror close enough to the steam from the water so that it gets fogged up. Close the door so the steam stays in the bathroom.
Observe what happens. Can you read the message?
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