Fingerprinting. By Melissa Chang. Fingerprinting: Introduction. What Is a Fingerprint?.
By Melissa Chang
The skin on our fingers are made up of many ridges of skin that are created when we are still in our mother’s womb. They remain the same for the rest of our lives, even surviving injury if not too severe. Each of the ridges connect to other ridges, forming a pattern that is unique to all others. No two people in the world have exactly the same print. This uniqueness is used in many forensic cases to solve crimes, as some of the most common evidence found at a crime scene are fingerprints.
Examples of types of minutiae from perso.orange.fr/.../types/fingerprint.htm
The most commonly found types of fingerprints are whorls, while the least common types are arches. Loops fall somewhere inbetween.
There is more specific types of classification techniques, and these are just the most basic three. For example, arches can be broken down into plain arches or tented arches, and whorls can be broken down into accidental whorls, or any other number of whorl types.
The primary classification system is a system concerning the whorl patterns in the fingerprints. Everyone is assigned a pc value according to the whorls on their fingers. This system is not used for identification, but for narrowing the pool of candidates.
Sir Francis Galton
Fingerprint dusting in a lab
Fingerprint visualized with iodine fuming.
Silver Nitrate spray bottle
Taken from seattlepi.nwsource.com/local/162685_brain01.html