Search Results
Showing results 1 to 1 of 1
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-295.jpg?itok=EUCBF12d)
Mystery Writing: Write and develop a secret message
Source Institutions
Learners write an invisible message using lemon juice on a piece of paper. They then develop the message by soaking the paper in a dilute iodine solution.