- Put a few centimetres of cold water and food colouring into the mug.
- Place the celery into the mug and leave for a day or so.
- Cut open the celery and see here the colour has reached.
- You could even split the celery stick at the base and place each half in a different colour to make multicoloured celery!
Disclaimer: Please follow the instructions carefully. This is for your own safety and the safety of others. Do not improvise or change the quantities or actions or othe order in which each step in the experiment is listed.