The tips of a person's fingers have small friction ridges on them. Along the ridges are small pores which secrete salt, water, and proteins. These substances along with oil that your fingers may pick up from your skin or hair will be deposited on things that you touch, leaving fingerprints . Your overall fingerprints are unique to you. As you grow, your fingerprints grow bigger but the pattern is always the same.
Scientists classify fingerprints into several general patterns.
The following is an easy procedure for making clear fingerprints to examine. You may want to involve volunteers from local law enforcement agencies in fingerprinting activities. Procedure With a soft pencil make a dark spot a little bigger than a fingertip. Fill it in completely and go over it many times. Prepare a piece of clear tape about 5 cm.