General Types of Fingerprints
Posted: Sunday, December 16, 2007
by Fabiola Castillo
SCN Company
In the world of crime scene investigation, there are three kinds of fingerprints that show up at a crime scene. In this article, I will attempt to explain what the three kinds of fingerprints are.
In general, fingerprints come in three types that rely on how and where they were left behind. A fingerprint found on an oily wall is much easier to find than one left on a plastic Wal Mart bag without any visible substance.
- Patent fingerprints happen when a medium such as grease, dirt, blood, ink, or paint on the fingers of the offender of a crime leaves behind a readily available fingerprint that is visible to the naked eye.
- Plastic fingerprints have a three-dimensional characteristic and happen when the offender consciously or unconsciously presses a fingerprint into a soft medium such as margarine, soap, caulk, wax, silly putty, or even dust.
- Latent fingerprints are not visible to the naked eye and can not be seen without special light circumstances or special means of processing.
The first two types of fingerprints, patent and plastic, can be photographed. The photograph can be used for comparison. Many times the fingerprint is lighted at a slight angle to increase contrast. However, very little else is required to make these prints capable of being documented. If the offender does not leave behind any visible fingerprints, identification is still likely but definitely more difficult to obtain. The tools for tracking down fingerprints can be as simple as a penlight or black powder as sophisticated as chemical reactions, Super Glue, or lasers. Whichever technique criminal investigators use is dependent upon the surface on which the fingerprint rests. For harder surfaces, powders, in general, are used, and chemicals are many times needed on more porous surfaces. Some fingerprints are visible under an ultraviolet light source or even a small flashlight.
The next time you watch your favorite CSI program, you will have an insight on the terms patent, plastic, and latent fingerprints.
Fabiola Castillo is an online marketer for the website NinjaCOPS SuperStore. This virtual store specializes in personal defense products where you can buy pepper spray, kubaton keychains, wireless hidden cameras, nunchaku technique videos, Taser stun guns, expandable steel batons, and many other home security products.
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Top-level comments on this article: (2 total)its helpful with the definitions but it needs alot more info on the three fingerprints.
Great article and enhances the good work done by forensic science researchers when analysing crime scenes.
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