Direct Fingerprints are Prints that are visible and occur when a Foreign Substance on the skin of the finger comes in contact with the smooth surface of another object. Prints like this leaves a distinct ridge Impression that is visable to the naked eye and does not need special equipment to see it. Examples of Direct Prints are Blood or oil on such as a white wall.
Plastic Prints are visible impressed prints that occur when a finger touches a soft, malleable surface resulting in an indentation. Examples are Play Doh, Wax, Gum, or fresh paint. Prints like this do not need any Special equipment to see them.
Latent Prints are Fingerprint impressions secreted in a surface or an object and cannot be seen by the naked eye. These prints result from perspiration which is derived from sweat pores found in the ridges of fingers. When Fingers touch other body parts, moisture, oil and grease adhere to the ridges so that when the fingers touch and object, such as a lamp, a film of these substances may be transferred to that object. The impression left on the object leaves a distinct outline of the ridges of that finger. These fingerprints must be enhanced upon collection and, because they serve as a means of identifying the source of the Print, they have proven to be extremely valuable over the years in the identification of the source.
No comments:
Post a Comment