5. Leave it for a full day to get the best results.
This is very exciting to observe! What happened to the penny? It turned green.
Coloured Flower 变色的花
Materials you will need:
Water
Scissors
Food Colouring
Jar, Plastic Cup or Test Tube
A Flower or Celery Stalk
This is a colour changing experiment.
Steps:
1. Fill the cup with water.
2. Add a few drops of food colouring
3. Cut the end off the stem
4. Put the flower in the water
Watch and in time the food colouring will be sucked up the stem along tiny tubes and the petals of the flower will start to change in colour.
Another way to try this experiment is to get a flower with a long, thick stem and slit it carefully from the bottom and put one end in separate test tubes . Your flower should have petals in two different colours.
Did you know that plants need water to live? As well as absorbing water from the atmosphere through their leaves, they suck water up through their stems. If you used the celery stalk for the above experiment you could cut the stalk and see that the little holes inside are coloured.
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★ 雅思高分学员杨洋
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