Fingerprint revealing spray and method for revealing fingerprints by using same

Abstract

The present invention provides a fingerprint revealing spray. Based on the total weight of components (A), (B) and (C), the spray includes: (A) 1 to 10 parts by weight of an amino acid reactant; (B) 5 to 30 parts by weight of a dispersant; and (C) 50 to 150 parts by weight of a propellant. According to the present invention, due to containing the dispersant and the dispersant, the spray has a good fingerprint revealing effect with convenience, and reduces the use of toxic chemicals which pollute the environment, to achieve purposes of low cost and non-contamination to a specimen; and thus purpose of applying the spray in the latent fingerprint detection technical field can be achieved.

Description

technical field [0001] The invention relates to a spray for displaying fingerprints and a method for displaying fingerprints by using the spray, in particular to the technical field of latent fingerprint detection. Background technique [0002] Fingerprints are the lines formed by the bumpy skin on the pads of primate fingers, and can also refer to the impressions these lines imprint on objects. When a human finger touches an object, it usually leaves fingerprints on the object, and these prints are most often used as evidence in criminal science and forensic science. Since the fingerprints on many physical evidence found at the crime scene are usually invisible to the naked eye, they are called latent fingerprints, so research focuses on applying various techniques to make latent fingerprints visible for analysis. [0003] At present, the latent fingerprint display methods studied in the laboratory mainly include the fumigation method, the silver nitrate method and the nin...

AI Technical Summary

Problems solved by technology

However, this method requires complex pretreatment and requires a certain degree of operational proficiency, and also has disadvantages such as contamination of samples.

In addition, the yellow powder can also be covered on the specimen, sprayed with water in the form of a spray, and then irradiated with laser light to stimulate fluorescence to reveal fingerprints, but this method must use a laser irradiating device, and the procedure is complicated and there are many steps

In addition, in criminal investigation, a solution containing ninhydrin is often used to coat the specimen, which has a good effect on latent fingerprints, but if the specimen is thermal paper, it will destroy the thermal paper to a certain extent content on

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