Materials Required:
- Paper
- 2B or 3B pencil
- Transparent sticky tape
- Magnifying glass
Procedure:
- Blacken a piece of paper with a
2B or 3B soft lead pencil and then rub one of your fingers on the paper vigorously to blacken it too. If necessary, rub the pencil once again on the paper because you need a thick layer of the black lead powder on your finger. - Now, cut about 5 to 6 cm long strip of transparent sticky tape and place the blackened fingertip on the sticky side, pressing it carefully there. Now, when you remove your finger, you will find a mark on the tape which is your own fingerprint! Stick this side of the tape on a blank paper. Now, it is fully preserved.
- Similarly, take the prints of your other fingers and also of your members and friends. Don’t forget to write down the names of the persons against their fingerprints.
- Viewing these fingerprints with a magnifying glass, you will observe that no two fingerprints are identical.
This is what happens:
That is why the fingerprints found at the place of crime play an important role in apprehending criminals by the police. The fingerprints taken from the site of crime are tallied with the fingerprints of the professional criminals and of the other suspects available in the police records to identify criminals.
