Up next in How to Do Fun Tech & Science Projects (52 videos)
Teach your children technical skills and science in fun ways with the tech and science projects in this Howcast video series.
You Will Need
- Lemon juice
- A bowl
- A cotton swab
- White paper
- A light source with a 100-watt light bulb
- Milk (optional)
- Vinegar (optional)
- Orange juice (optional)
- Paintbrush (optional)
- Toothpick (optional)
Put lemon juice in bowl
Put the lemon juice in a bowl and dip your cotton swab in the lemon juice.
Write your message
Write your secret message on the paper with your cotton swab and let the writing dry completely. The message will be invisible when the message dries.
Heat the paper
Hold the paper near the light bulb to expose it to the heat, but don’t rest the paper on the bulb.
Watch in amazement as the message magically appears. The words will appear in a tan or brown color.