science

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. waterc

2. ink pen

3. cup

4. strip of paper 

5. 

6. 

Process:

Step 1: put water into the cup

Step 2:colour the strip of paper

Step 3:dunk the strip of paper in the cup of water

Step 4:  wait for a little bit .

Step 5:

Step 6:

Conclusion: What have I learnt from this experiment?