A method for developing latent fingerprints using nitrocellulose membrane and water
A technology of nitrocellulose membrane and latent fingerprint, which is applied in application, medical science, sensor, etc., can solve the problems of poor cross-fingerprint display effect, inability to display display effect, bad effect, etc., and achieve good display effect and good practical application value , The process is environmentally friendly and efficient
Inactive Publication Date: 2017-12-08
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a simple, cheap, fast, environmentally friendly, high-sensitivity method for utilizing nitrocellulose membrane and water to reveal latent fingerprints that can be applied to crime scenes and a wide range of objects. Problems that cannot be displayed or have poor display effects on difficult objects, and poor cross-fingerprint display effects
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[0026] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0027] Aiming at the problems that the existing methods cannot or have poor visualization effects on difficult objects and poor cross-fingerprint visualization effects, the invention provides a method for visualizing latent fingerprints by using nitrocellulose membrane and water.
[0028] Taking the display of latent fingerprints on five yuan banknotes as an example, the following steps are used to display latent fingerprints:
[0029] (1) Cut the NC membrane into a size of 2cm×2cm with scissors, and put it in a plastic petri dish that is scrubbed with ethanol for later use;
[0030] (2) Gently press the fingerprint of the oil submersible on the surface of the five yuan RMB;
[0031] (3) Use fingerprint tape to transfer the oil latent fingerprint on the...
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The invention provides a method for representing latent fingerprints through a nitrocellulose membrane and water and belongs to the technical field of fingerprint identification. According to the method, the latent fingerprints printed on or transferred to the surface of the nitrocellulose membrane are soaked in the water, the ridge line area, covered with fingerprint residues, of the nitrocellulose membrane cannot be wetted, the corresponding valley line area can be wetted, and the color backgrounds of the two areas have a remarkable difference so that a fingerprint contour can fast and efficiently appear. According to the method, operation is easy and fast, raw materials are low in price and easy to obtain, the process is environmentally friendly and efficient, the effect resolution ratio is high, the method is applicable to appearance of latent fingerprints transferred from the surfaces of various common objects (such as glass, ceramic, metal, paper and plastic) and difficult objects (such as paper money, skin and leather) on which the latent fingerprints cannot appear through a traditional method, and has a very good appearance effect of crossed latent fingerprints and old latent fingerprints, and besides the method is applicable to on-site detection of the latent fingerprints. Thus, the method has very good actual application value in the fingerprint identification field.
Description
technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a method for developing latent fingerprints by using nitrocellulose membrane and water. Background technique [0002] Fingerprints, that is, the pattern of the skin of the human hand, including papillae pattern (fingerprint, knuckle pattern and palm print), flexor folds, wrinkles and scars on the palm surface. Latent fingerprints refer to the fingerprint lines formed on the surface of the object by natural body secretions such as sweat and oil, which are difficult to detect visually and are the most common type of fingerprints at crime scenes. Fingerprints are different from person to person, remain unchanged for life and leave traces on objects touched. Fingerprint identification is one of the most reliable methods of personal identification and is used in forensic science to verify, expose and prove crimes; victims of some accidents or natural disasters are ...
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IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 张美芹李小龙
Owner UNIV OF SCI & TECH BEIJING