The subdiscipline of fingerprints is more commonly known in the field of forensics as latent prints. Fingerprints are formed while you are developing in a mothers womb and remain unchanged until complete decoposition. Fingerprints are one of the most unique identifying marks a person can have...no two fingerprints have ever been found to be the same.
What Makes a Print?
Sweat, oil from sebaceous glands in non-friction ridge skin, and contaminants such as lotion, blood, or grease from food, can all be on the surface of the ridges. These substances act either as invisible or visible ink, creating an impression of these ridges when an object is touched