This homemade invisible ink has only one common ingredient: milk! Using a small paintbrush or cotton swab, you will write secret messages on a piece of paper. Once the ink dries, the message is completely invisible and is only revealed when the paper is held near a heat source!
Actua is a leading Canadian science, technology, engineering and mathematics (STEM) youth outreach organization. Each year, the Actua network engages over 375,000 youth in 600 communities across Canada in transformative STEM learning experiences that build critical skills and confidence. Please visit www.actua.ca.