Aim: To figure out which pen is used to write a forgery letter.
Hypothesis: We will know what pen was used.
Method: Beaker, Filter paper, Pen, Sellotape and water.
1. Put a dot on the filter paper 2cm up.
2. Put 50ml of water in the beaker.
3. Put the paper in the water and leave it for 5 minutes.
4. Attach a peace of the letter to the paper with the sellotape.
5. Place the paper in 50ml of water.
6. Compare the two ink marks.
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