crime paper 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. cup

2. water

3. crime paper

4. 3 dark coloured pental pens

5. warm water

6.  cold water

Process:

Step 1: place the cup on a table.

Step 2: get the crime paper and fold it of 25%.

Step 3: get the warm water wand pour drops in the cup.

Step 4: place 3 dots with all 3 pental pens, only 1 per pental pen (on crime paper.).

Step 5: place the crime paper in the cup make sure it has the 25% out side the cup.

Step 6: slowly pour the cold water in the cup and wait for the colours to appear.

Conclusion: What have I learnt from this experiment?