Invisible Ink Experiment

Invisible ink is a fun experiment for kids everywhere. Pull this out of your back pocket on a rainy or boring day and – Viola! – happy kids. This experiment can be done with items that are probably around the house, and creates minimal waste.

What You Need:

  • Lemon Juice
  • Small Bowl(s)
  • Cotton Swabs
  • White Construction Paper
  • Blowdryer

This experiment is demonstrating oxidation. First, pour the lemon juice into your small bowl. Dip the cotton swab into the bowl and use it to write or draw on the white construction paper. The “ink” will fade away as it seeps into the paper. It’s invisible! Use the blow dryer on low speed to heat the liquid so it oxidizes and you can see your message or image once again. (If you use freshly squeezed lemon juice, your message will turn brown. If you use ReaLemon juice, your message will become visible when held up to the light.) You can also try experimenting with other liquids you may find in the kitchen – like milk, vinegar, apple juice, or orange juice. Which invisible ink reappears the best?