Fingerprinting

History of finger prints

-In prehistoric times fingerprints were used in transactions

-In 1686 the different types of fingerprints were discovered

-In 1880 Dr. Faulds discovered that fingerprints can be used as identification and classification. In 1903 New York state prison used the first systematic fingerprinting use for criminals.

http://onin.com/fp/fphistory.html\

There are 3 different types of fingerprints. Those can be classified as direct, latent, and plastic.

Direct-Direct prints are whats found and are completel visible because it is blood or dirt residue. they can be colleted by tape.

Latent-   Latent prints are not immediately visible. They are formed from the sweat from our bodies. . They can easily be made visible by simply dusting, fuming or using various chemical reagents.

Plastic - A plastic print is an impression left in a material that holds the shape of the ridges in their fingertips.  Examples of plastic prints are candle wax, putty or clay. Such prints are already visible and need no additional materials to make them more visible.

http://belladia.typepad.com/.a/6a00d8341cc08553ef0133ed135080970b-800wi

http://en.wikipedia.org/wiki/Fingerprint#Patent_prints

 Getting a fingerprint isn’t always easy, especially if it is on one of these surfaces; nonabsorbent, porous, hard, and smooth surfaces. These are the different techniques to getting prints from these surfaces.

Fingerprints that are made on hard and nonabsorbent surfaces for example, glass. They are surfaced with powers. But on the other hand a porous surface, such as cloth and paper are made visible by the use of a chemical such as Iodine when used in fuming.

http://www.bxscience.edu/publications/forensics/articles/fingerprinting/f-fing03.htm

The basic shapes and patterns of fingerprints are Arches, loops and swirls.

There are tented arches, swirls or whorls, ulnar and radial loop just to name a few.

 tented arches  whorl

http://www.odec.ca/projects/2004/fren4j0/public_html/fingerprint_patterns_files/image003.GIF

http://www.academyofhandanalysis.org/wp-content/uploads/2010/10/whorl.jpg

You lift fingerprints by first if you need to powder them is to do so. Next you would take your tape and once you lift that place it against a black or white sheet which ever applies to you. If there is a fingerprint on a gun, or in a car per say those fingerprints and be recovered by the process of fuming. You encase whatever you want the fingerprint on in a room or encasement which is being filled with gas which could be iodine. Within a matter of time your prints will appear.

http://www.bxscience.edu/publications/forensics/articles/fingerprinting/f-fing03.htm

In my reflection:
  We got oils on our finger thasn pressed firmly on glass or another flat surface. We used powder to recover the the prints, than we pressed tape firmly against it to lift the fingerprint. Lastly, we placed it on a light surface so we can see the dark print.