Monday, August 24, 2009

Types of Fingerprints




Latent Fingerprint: a fingerprint made by deposits of oils and/or perspiration, not usually visible to the human eye. Various technologies, including lasers, can be used to identify latent prints.





Direct fingerprints: obvious to the human eye and are caused by a transfer of foreign material on the finger, onto a surface. Because they are already visible they need no enhancement they are usually photographed instead of being lifted in the same manner as latent prints (i.e blood prints)


http://thumbs.dreamstime.com/thumb_39/11382857244e1rUJ.jpg




Plastic Fingerprints: occurs when the finger touches or presses against a plastic material in such a way that a negative impression of the friction ridge is produced. These types of prints are generally found in places like a newly painted object, wax from candles or sealants, in the gum on envelopes and stamps, on substances that melt easily or soften when they are held in the hand. An example of this would be chocolate.

http://technologyinterface.nmsu.edu/summer97/security/finger.html






https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWTY3ojaqD5DV1yi-dTLDOzqX55anyOD38z1ehvnisA6ECoGM8uAOZSV6C1SbaCHMkj-h_M9OFLQlABSxP3vku0vAtkDsruHjEuigWAW5UA-cA5vq9GVqAbKy7nXxG2pgcr1XA4cNBZaL0/s1600/Ancient+Fingerprints.jpg





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2 comments:

  1. Elijah Y-BAugust 27, 2009 at 11:22 AM

    Very smart and informative links you put in here Mary, and like I said the sidebar with the different types of fingerprints was a very sagacious idea!!

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  2. Olivia K.August 27, 2009 at 11:39 AM

    Mary: you are the definition of academic excellence. I can't think of anything you're msising here. Hmm.. Maybe a picture of a direct and a plastic fingerprint? I'm pretty sure that the two you have up are both latent. Otherwise, awshum.

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