大象传媒

Invisible ink experiment

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Need to send secret messages? Dr Chris and Dr Xand have a brilliant experiment for spies in training... Create your own invisible ink! Shh!

You will need
  • White paper or card
  • Two cups or small bowls
  • Teaspoon
  • Tablespoon
  • Cotton buds or a paintbrush
  • Old newspapers or recycled cardboard
  • Paper towels or kitchen roll
  • Bicarbonate of soda
  • Water
  • Turmeric
  • Surgical spirit
  • Rubber gloves
  • Lab coat or old clothes

Instructions

Step 1: Put on your rubber gloves and lab coat (or old clothes) because turmeric can stain clothes and cover table tops with cardboard.

Step 2: In a bowl, mix a tablespoon of bicarbonate of soda with a tablespoon of water.

Step 3: Next, in the other bowl, mix half a teaspoon of turmeric with three tablespoons of surgical spirit.

Get a grown-up to help you pour the surgical spirit.

Step 4: Dip the cotton bud into bowl one and write your secret message on the paper.

Step 5: Allow to dry and brush off any bicarbonate of soda left.

Step 6: Take a brush, dip it in the turmeric and surgical spirit mix and paint it over the secret message.听

Step 7: You'll notice the message magically emerging!

听

Watch the whole episode of Operation Ouch! Do Try This At Home: Invisible Ink on 大象传媒 iPlayer.

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