Introduction: How to Create a Fingerprint Detector (simple)
You need to:
1 - pencil
2 - a knife
3 - paper
Step 1: Step2
.Then stripping the pencil of wood as in the picture
Step 2: Step3
Grind the lead and put it in a bowl.
Step 3: Finished
Put the powder on the place of the fingerprint , then remove it and you will see ...