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Latent fingerprint developing cotton sheet and application

A technology of latent fingerprints and fingerprints, which is applied in applications, preparation of test samples, medical science, etc., to achieve uniform distribution, easy to carry, and convenient and simple operation process

Inactive Publication Date: 2020-01-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-woven substrate is used as the carrier of the revealing agent, especially for latent fingerprints that are invisible to the naked eye, providing a kind of latent fingerprint wet sheet that is easy to carry, easy to operate, and has a good display effect.

Method used

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  • Latent fingerprint developing cotton sheet and application
  • Latent fingerprint developing cotton sheet and application
  • Latent fingerprint developing cotton sheet and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a method for preparing a Coomassie Blue solution fingerprint visualization cotton sheet, and the specific steps are as follows:

[0037] 1. Cut the cotton non-woven fabric substrate to a size of 2 cm×3 cm.

[0038] 2. Preparation of cotton sheet loaded with developer

[0039] Take 0.02 g of Coomassie blue solid in a 50mL Erlenmeyer flask, add 1 mL of glacial acetic acid and 9 mL of anhydrous ethanol solution in sequence at room temperature, shake the Erlenmeyer flask to completely dissolve the solid to obtain 10 mL of Coomassie Blue developer, take Put 300 μL of the visualization agent in a weighing bottle, put two cut cotton pieces into the weighing bottle and soak for 1 min to obtain Coomassie blue visualization cotton pieces;

[0040] Take 0.1 g of amino black 10B solid in a 50 mL conical flask, add 0.5 mL of glacial acetic acid and 9.5 mL of absolute ethanol solution in turn, shake the conical flask to completely dissolve the solid to obtain 10 mL o...

Embodiment 2

[0046] This example provides a fresh occult blood fingerprint on the surface of a cover glass object. The cotton sheet prepared in Example 1 is used to visualize occult blood fingerprints. The fingerprint images obtained under natural light are combined with the immersion method, dip coating method, and spray display method. The specific steps are as follows:

[0047] 1. Place the cover glass object loaded with fresh occult blood fingerprints in a cool and dry place for 24 hours;

[0048] 2. The cotton sheets prepared in Example 1 soaked in Amido Black 10B, Coomassie Blue, Eosin, and Acid Fuchsin Visualizer were smoothly covered on 4 cover glass objects carrying occult blood fingerprints, and pressed slightly Ensure that the cotton sheet is in full contact with the object, and let it stand for 2 minutes;

[0049] 3. Remove the cotton piece from the cover glass steadily. After drying, under natural light, take a picture of the occult blood fingerprints revealed by the cotton piece.

...

Embodiment 3

[0053] This embodiment provides an old occult blood fingerprint on the surface of a white enamel object. A cotton sheet is prepared to visualize the occult blood fingerprint, and the fingerprint image obtained under natural light is combined with the fingerprint after the occult blood fingerprint is visualized by the dip coating method and the spray display method. Picture for comparison.

[0054] The specific steps for preparing the visualization cotton sheet are as follows:

[0055] 1. Cut the cotton non-woven fabric base material to a size of 20 cm×30 cm.

[0056] 2. Preparation of cotton sheet loaded with developer

[0057] Take 2.00 g of Coomassie blue solid in a 1 L Erlenmeyer flask, add 100 mL of glacial acetic acid and 900 mL of absolute ethanol solution at room temperature, shake the Erlenmeyer flask to completely dissolve the solid to obtain 1.0 L of Coomassie Blue developer. Soak a cut cotton sheet in 30 mL of visualization agent for 2 minutes to obtain Coomassie blue visu...

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Abstract

The invention discloses a latent fingerprint developing cotton sheet and application. A non-woven fabric is used as a base material and immersed in a fingerprint developing agent, the base material isin a wet state after being adsorbed and loaded with the fingerprint developing agent, and the latent fingerprint developing cotton sheet is obtained. The cotton sheet is immersed in the developing agent to prepare the developing cotton sheet, and by controlling the amount of the developing agent, the developing cotton sheet which does not contaminate a latent fingerprint object can be obtained; and the developing cotton sheet covers an object containing the latent fingerprint, after the cotton sheet is torn off, the object is naturally dried, fingerprint lines can be observed under a light source matched with the developing agent, and the fingerprint lines are suitable for photographing and recording. According to the method for developing the latent fingerprint by the cotton sheet, the development effect is good, portability is achieved, operation is simple, and the development time is short; the application range is wide, and cotton sheets of different sizes carrying different developing agents can be prepared; and the cotton sheets can be reused and suitable for criminal investigation on-site operation and industrial production.

Description

Technical field [0001] The invention relates to a fingerprint manifestation method, in particular to a manifestation cotton sheet based on a non-woven fabric substrate and its application, and belongs to the technical field of trace inspection. Background technique [0002] With the development of the fingerprint automatic identification system (AFIS), fingerprints, as one of the important physical evidences in criminal investigation and forensic science, have received great attention from researchers. Among them, latent fingerprints are often seen in crime scenes and are invisible to the naked eye. The non-ignorable part of fingerprint recognition. [0003] Latent fingerprints can be divided into occult blood fingerprints, sweat latent fingerprints and grease fingerprints according to their components. One of the most commonly used methods to visualize occult blood fingerprints is the chemical enhancement method, that is, to select appropriate chemical reagents and appropriate op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1172G01N1/28
CPCA61B5/1172G01N1/28
Inventor 范丽娟樊智楠马荣梁
Owner SUZHOU UNIV
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