Pebble and scribble

Creative and fun craft ideas for children

Making bicarbonate of soda crystals

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Bicarbonate of soda crystals

Bicarbonate of soda crystals

This summer term has flown by so quickly I haven’t had time to post any of the craft or activities that we have been doing over the last few months. We made these bicarbonate of soda crystals, great fun and took me right back to my childhood, I remember making these with my mum and my sister. It is facinating to see the crystals appear on the wool, and after a couple of days of patiently waiting, they hang quite dramatically on the wool.


They are really fun and simple to make, and Ted loved the idea of doing a mini science experiment. He enjoyed carefully measuring out the bicarbonate of soda and he showed great patience waiting for the crystals to appear.


You will need

  • Two glass jam jars
  • Bicarbonate of soda
  • Wool – use natural wool rather than synthetic
  • Two paper clips
  • Spoon
  • Water

How to make your own

  1. Fill two glass jar up to the rim with warm water
  2. Into each jar, stir about 8 tea spoons of bicarbonate of soda and stir until disolved
  3. Cut a lengh of wool about 20cm long – we used both natural and synthetic wool to see which worked best, and the natural wool was far better because the synthetic wool didn’t absorb water avery much
  4. Tie a paper clip onto each end of string, then drop one end into one jar and the other end into the other and wait
  5. Over a couple of days, the water starts to travel up the string and then as the water evaporates it leaves behind crystals. By the end of a week, we found that we had crystals on the wool, and also on the plate below – which we placed there to catch crystals. It was fascinating to see them slowly grow and a real test of patience to look rather than keep fishing out the paper clips.
Carefully measuring bicarbonate of soda

Carefully measuring bicarbonate of soda

Stirring in the bicarbonate of soda

Stirring in the bicarbonate of soda

Waiting patiently

Waiting patiently

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