Aim: To separate colours by using the process of chromatography.

Definition: Chromatography is a method of separating out materials from a mixture.

Eg. blood, ink, drugs,

Scenario

A crime has been committed. The police have a signed cheque and a letter from the same crime scene but it seems like the handwriting is different. They have 3 suspects but not enough evidence. They need to know if the letter and the cheque were written by the same person.

How do they tell if the pens used for both of these pieces of evidence are the same?

Rainbow paper

Materials;

1. cup

2. chromatography paper

3. water-based pens

4. water

Process:

Step 1: get chromatography paper one cm up the paper and pot water-based pen bots.

Step 2:  Get a cup to fill 1/2 cm of water on the bottom of it.

Step 3: wait for about 10 minutes.

Step 4: done should have a rainbow going up your paper

Conclusion: What have I learned from this experiment? black is the best color for doing this. purple is the second best color. there's such thing as chromatography paper.