Color changing invisible ink, kids science experiment

ByKarthik Kumar D Kon23rd Jul 2023, 2023-07-23T11:30:00+05:30
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Color changing invisible ink, kids science experiment

Title: Color-Changing Invisible Ink - Chemical Reaction Experiment

Objective: To create and reveal color-changing invisible ink using a simple chemical reaction.


  • Lemon juice or white vinegar
  • Water
  • White paper or a blank sheet of paper
  • Cotton swabs or small paintbrushes
  • Heat source (hairdryer or iron)
  • Optional: Food coloring for additional color effects


  1. Create the invisible ink solution by mixing equal parts lemon juice or white vinegar and water in a small bowl or cup. Stir the mixture well.
  2. Optional: Add a few drops of food coloring to the solution to create colored invisible ink.
  3. Dip a cotton swab or small paintbrush into the invisible ink solution.
  4. Use the soaked cotton swab or paintbrush to write or draw on the white paper. Encourage children to be creative and experiment with different designs or messages.
  5. Allow the paper to dry completely. The invisible ink should become virtually undetectable once dry.
  6. Once the ink is dry, use a heat source (hairdryer or iron on low heat) to gently warm the paper. Ensure not to overheat or burn the paper.
  7. As the paper is heated, the color-changing reaction will occur, and the invisible ink will become visible. The heat causes a chemical reaction with the components of the invisible ink, revealing the hidden colors.
  8. Observe the colors emerging and discuss the chemical reaction involved. Explain that the heat activates the reaction between the lemon juice or vinegar and the compounds in the invisible ink, causing the color change.
  9. Reflect on the experiment and discuss how variations in the ink solution's concentration or the application of different heat sources might affect the results.

Safety Considerations:

  • Adult supervision is recommended when using heat sources like hairdryers or irons to ensure safety and prevent burns.
  • Be cautious with the use of heat sources and ensure they are handled responsibly.

This experiment allows children to explore chemical reactions and witness the color-changing properties of invisible ink. It promotes scientific observation, critical thinking, and creativity. Enjoy the excitement of revealing hidden messages with your color-changing invisible ink experiment.

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