How To: Make invisible ink

Make invisible ink

Write a secret message with invisible ink using these simple household items.

Step 1: Put lemon juice in bowl

Put the lemon juice in a bowl and dip your cotton swab in the lemon juice.

TIP: Using milk, vinegar, or orange juice instead of lemon juice will have the same effect.

Step 2: 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.

TIP: You can use a paintbrush or a toothpick instead of a cotton swab.

Step 3: 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.

Step 4: Message appears

Watch in amazement as the message magically appears. The words will appear in a tan or brown color.

Did you know? Arizona and California produce 95 percent of the U.S. lemon crop.

Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.

Buy Now (97% off) >

Our Best Phone Hacks

Gadget Hacks' tips — delivered daily.

Be the First to Comment

Share Your Thoughts

  • Hot
  • Latest