Rainbow Paper

Hurumanu - Rainbow Paper

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. Paper.

2. Pencil.

3. Ruler.

4. 2 markers.

5. Cup.

6. Water.

Process:

Step 1: Get paper.

Step 2: Rule a line with the pencil 1cm away from the bottom of the paper.

Step 3: Draw 2 dots on the line.

Step 4: Fold the paper over the side of the cup.

Step 5: Pour a little bit of water in the cup.

Step 6: Watch.

Conclusion: What have I learnt from this experiment?

Water travels up the paper because water is sticky and the molecules like to stay together and go up.