Looking at inks and investigating how the chemicals separate in water.
You will need
Strips of Blotting paper
Felt pens including several different black pens
Several plastic transparent pots with a couple of cms of water in each pot
- Draw a circle of colour at the bottom of each strip of blotting paper using a variety of coloured pens.
- Suspend each strip of blotting paper from a straw using a peg as shown so that bottom of the paper dips into the water allowing the water to then soak up through the paper.
- Ask the children if they can guess what might happen.
- Watch the paper absorb the water and discuss what is happening to the picture.
To extend the activity
- Each child could then do their own drawing on a dry piece of blotting paper using several colours and dip it in the water as before.
- Draw some circles using the different black pens.
- Ask the children if they think the black ink will stay the same colour or will it change when dipped in the water.
- Compare the results from the different black inks, hopefully there will be some differences.