You will need:
- water-soluble marker pens in three different colours (blue, black and green work really well)
- blotting paper or coffee filter paper (kitchen towel should work well too)
- scissors
- water
- three glasses
- paper clips
Method:
- Cut three strips of filter paper to the same height as your glasses.
- Use a different colour marker to draw a large dot about 2 cm from the bottom of each strip.
- Pour 1 cm of water into three glasses.
- Lower each of the strips of paper into a glass and fix them to the side of the glass with a paper clip. The dots should be about 1 cm above the level of water.
- After a few minutes, each of the dots will have separated into different colours. You will be able to see which colours make up each ink.
How does it work?
Research: chromatography
