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Application of sulfur-nitrogen polymer in fingerprint development

A polymer and fingerprint technology, applied in the field of forensic science, can solve the problems of low success rate and complexity of fingerprints, and achieve the effect of safe use, obvious contrast between lines and backgrounds

Pending Publication Date: 2021-02-05
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The situation of fingerprints on metal surfaces in real crime scenes is relatively complicated. For example, after washing, soaking and other special circumstances, the fingerprints left on the metal surface have been removed. The success rate of fingerprints in such cases is generally low. Difficulties in the appearance of handprints of such difficult objects have become a new direction of research

Method used

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  • Application of sulfur-nitrogen polymer in fingerprint development
  • Application of sulfur-nitrogen polymer in fingerprint development
  • Application of sulfur-nitrogen polymer in fingerprint development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1. Potential fingerprints of copper and copper alloys are undamaged and revealed using polymers

[0029] Take copper or copper alloy sheet (length 6cm, width 2.5cm), and set aside after natural stamping. Take 1.5-3g of sulfur nitrogen polymer (x is 20-25) to appear after a certain period of time, and observe with naked eyes, the results are as follows:

[0030] The appearance of potential handprints in the following states adopts the same method: place the sulfur-nitrogen polymer in an aluminum foil container (inner diameter is 30cm, height is 40cm), and then hang copper or copper alloy sheet above Fingerprints can be displayed at a height of 10cm;

[0031] 1. The potential fingerprints on the copper surface are not damaged. After the fingerprints are left for 24 hours, they will appear at a low temperature of 0-5°C for 40 days. The effect after the appearance is as follows: figure 1 shown.

[0032] 2. The latent fingerprints on the surface of the copper allo...

Embodiment 2

[0034] Example 2: Appearance of latent fingerprints of copper and copper alloys using polymers after being destroyed in a certain way

[0035] Take copper or copper alloy sheet (length 6cm, width 2.5cm), and set aside after natural stamping. Take 1.5-3g of sulfur nitrogen polymer (x is 20-25) to appear after a certain period of time, and observe with naked eyes, the results are as follows:

[0036] The appearance of potential handprints in the following states adopts the same method: place the sulfur-nitrogen polymer in an aluminum foil container (inner diameter is 30cm, height is 40cm), and then hang copper or copper alloy sheet above at a height of 10cm,

[0037] 1. After 12 hours of latent fingerprint printing on the surface of the copper alloy, rinse it slowly with tap water once and then dry it. Heat the aluminum foil container to 65-70°C and display it for 1 hour. The effect after displaying is as follows: Figure 4 shown.

[0038] 2. After 12 hours of latent fingerpr...

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Abstract

The invention discloses an application of a sulfur-nitrogen polymer in fingerprint development. A to-be-detected material is placed above the sulfur-nitrogen polymer, fingerprints can be displayed, and the to-be-detected material is metal, preferably copper or copper alloy; and the surface of the to-be-detected material is not damaged or is a damaged surface. The invention provides a new developing method for developing potential fingerprints on metals, especially copper and copper alloys, and particularly adopts the sulfur-nitrogen polymer as a fingerprint developing agent; the sulfur-nitrogen polymer belongs to a non-toxic material, does not need to add any additional chemical solvent, and is safe to use and environment-friendly; and fingerprints, streaks and backgrounds shown by the sulfur-nitrogen polymer are obvious in contrast and can be directly photographed and extracted, so that trace material evidences are provided for court judgment.

Description

technical field [0001] The invention relates to the application of sulfur nitrogen polymer in fingerprint display, belonging to the technical field of forensic science. Background technique [0002] It has been 100 years since the French doctor Aubert used silver nitrate solution to show sweat fingerprints in 1877. In the process of studying skin diseases and gland secretion, he applied silver nitrate solution on paper to show sweat fingerprints. Since then Become the originator of the creation of fingerprint display technology. From a simple solution visualization method, fingerprint visualization has now become a professional technology that comprehensively uses multiple disciplines, including chemistry, biology, physics and other disciplines. With the development of modern instruments, detection technology and new functional materials, people's exploration of fingerprints is no longer limited to the use of traditional physical and chemical methods, and various emerging t...

Claims

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Application Information

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IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 秦旗陈子龙吴浩王子政马荣梁宋丰发刘寰
Owner INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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