The hypothesis is that by writing a message with lemon juice and exposing it to heat, the carbon compounds in the lemon juice will break down and oxidize, causing the once invisible message to become visible.

You will use lemon juice as ink to write a message or draw a picture on paper. Then, after it dries, you will heat the paper with a hair dryer to reveal the hidden message.

You will need lemon juice, a small bowl, a q-tip, paper or paper towel, and a hair dryer.

When the secret message was heated up, the hidden message written with lemon juice became visible as it turned brown.

This science project is interesting because it teaches how a common household item like lemon juice can be used to create invisible ink and how heat can make it become visible.

Experiment variations to consider include using other citrus juices, like lime or orange juice, or experimenting with different heat sources to reveal the message.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!