How to Make Disappearing Ink

Write secret messages or create a great magic trick with disappearing ink.

You will need

  • Safety goggles
  • 100 milliliters ethyl alcohol
  • A bowl
  • 1 gram thymolphthalein
  • 900 milliliters of water
  • 10 milliliters 3-molar
  • sodium hydroxide
  • Soap and water
  • A squirt bottle
  • A white cloth
  • A cotton ball
  • Ammonia
  • 1 gram phenolphthalein (optional)
  • Vinegar

Step 1 Pour ethyl alcohol in bowl Put on your safety goggles and pour the ethyl alcohol into a bowl.

Step 2 Add thymolpthalein and water Mix in the thymolphthalein until it dissolves. Add the 900 milliliters of water, and stir.

Step 3 Mix in molar sodium hydroxide Mix in the 3-molar sodium hydroxide. You now have blue disappearing ink.

Step 4 Wash hands Wash your hands with soap and water.

Step 5 Test ink Pour the ink into a squirt bottle and test it by squirting the ink on a white cloth.

Step 6 Watch ink disappear Watch the ink disappear as it dries. Wet a cotton ball with ammonia and rub the area to make the ink reappear.

Step 7 Store in a container Store the ink in the squirt bottle to reuse.