Types of Fingerprints and Blood

Types of Blood



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Image from: http://www.softchalk.com/lessonchallenge/lesson/ImmuneSystems/Blood_009006.jpg

Types of Fingerprints

When a bloody, dirty, inky, or greasy finger comes in contact with a smooth surface, it leaves a visible impression called a visible or patent print. Fingerprints that have formed sweat from sebaceous glands on the body, water, salt, amino acids, or oils from the sweat can not be seen unless the are developed or photographed. The way you make these visible is with dusting, fuming, or chemical reagents. These prints are called latent fingerprints. Impressed prints (also known as plastic prints) are left in surfaces that are soft. Examples are: clay, wax and paint. They are visible and don’t have to be developed like Latent Fingerprints.

Citation:

"Types of Fingerprints." Online Digital Education Connection. Web. 24 Aug. 2009. .