How to Create a Fingerprint Detector (simple)

Intro: 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 ...