Want to send secret messages like a spy? 🕵️ With a few simple household items, you can create your own invisible ink and reveal it later like magic. This classic science experiment is fun, safe, and perfect for kids, parties, or school projects.
What You’ll Need
- Lemon juice (or vinegar)
- Cotton swab or paintbrush
- White paper
- Candle or light bulb (for revealing)
Step-by-Step Instructions
1. Write the Secret Message
Dip the cotton swab or paintbrush in lemon juice. Write your message or draw something on the paper. Let it dry completely. The writing will disappear!
2. Reveal the Secret
Hold the paper near a candle flame or a warm light bulb (do not touch the flame directly). Slowly, the hidden writing will turn brown and visible like magic.
Why Does It Work?
- Lemon juice is an organic substance.
- When heated, it oxidizes and turns brown.
- This reaction makes your hidden message appear!
Fun Variations
- Try milk, vinegar, or baking soda solution as invisible ink.
- Use grape juice to reveal baking soda ink.
- Create treasure maps or secret codes with friends.
Safety Note ⚠️
Always use adult supervision when working with heat. Keep the paper at a safe distance from the flame to avoid fire.
Conclusion
Invisible ink is an easy and exciting way to explore chemistry and reactions at home. With just lemon juice and a little heat, you can write secret messages and surprise your friends.
It’s science, it’s fun, and it feels just like being a real-life spy!
