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Teach your children technical skills and science in fun ways with the tech and science projects in this Howcast video series.
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
- 1 gram phenolphthalein (optional)
Pour ethyl alcohol in bowl
Put on your safety goggles and pour the ethyl alcohol into a bowl.
Add thymolpthalein and water
Mix in the thymolphthalein until it dissolves. Add the 900 milliliters of water, and stir.
Mix in molar sodium hydroxide
Mix in the 3-molar sodium hydroxide. You now have blue disappearing ink.
Wash your hands with soap and water.
Pour the ink into a squirt bottle and test it by squirting the ink on a white cloth.
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.
Store in a container
Store the ink in the squirt bottle to reuse.