Unlock instant, AI-driven research and patent intelligence for your innovation.

Environment-friendly powder for showing field fingerprints

A technology of powder and handprint, applied in organic dyes, medical science, diagnosis, etc., can solve the problems of destroying the original state of physical evidence, complex manufacturing process, and wide promotion, and achieve good display effect, high coloring strength and vividness, and convenient manufacturing Effect

Active Publication Date: 2021-06-11
ZHEJIANG POLICE COLLEGE
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the visualization methods of many handprint samples with unsatisfactory objective conditions have yet to be perfected; secondly, there are still potential safety hazards in the existing visualization reagents and visualization methods, such as small-sized dust suspended in the air when the brush visualization method is used, some organic Carcinogenic fluorescent dyes and toxic and harmful gases produced by the decomposition of substances during the fumigation method will cause serious harm to the health of professional and technical personnel
In addition, the use of some colored reagents will destroy the original state of physical evidence; some visualization reagents (such as DFO, etc.) cannot be widely promoted in actual work due to their high cost; Afterwards, it is still necessary to maintain the biological activity of handprints for in-depth DNA testing, etc. These have become problems that forensic science staff must face
[0004] Among the public technical solutions currently used in my country, such as the patent application of China University of Geosciences (Wuhan), the application number 201510054494.6, and the application number 200910063215.7 patent applied by Hubei Police Academy, are all materials of rare earth elements, the manufacturing process is complicated, and the cost is relatively high, not environmentally friendly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Environment-friendly powder for showing field fingerprints
  • Environment-friendly powder for showing field fingerprints
  • Environment-friendly powder for showing field fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Firstly, an environmentally friendly powder that shows on-site fingerprints is produced, which is composed of metal salt azo pigment and iron powder; the metal salt azo pigment and iron powder are ground into a powder of less than 6000 meshes, and the metal salt azo pigment is azo lake. , the molecular formula is C 27 h 17 N 3 o 8 S 2 Ba; fully mixed evenly; wherein the mass ratio of metal salt azo pigment and iron powder is 1:1.

Embodiment 2

[0020] The powder prepared in Example 1 is used for the determination of on-site fingerprints: according to the difference in the places where the fingerprints are left and the difference in the time of leaving them, the left marks are made respectively.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of material science and court science, and discloses environment-friendly powder for showing field fingerprints. The powder is prepared by mixing a metal salt azo pigment and iron powder, wherein the metal salt azo pigment and the iron powder are ground into powder smaller than 8000 meshes, and the mixing mass ratio is 1: (0.5-2). The invention has the advantages that the powder material is convenient to manufacture, has a good display effect in the use process, has high coloring strength and brightness, and is non-toxic and more environment-friendly.

Description

technical field [0001] The invention belongs to the fields of material science and forensic science, and in particular relates to an environment-friendly powder for displaying on-site fingerprints. Background technique [0002] The powder method for displaying sweat-submerged fingerprints is a traditional, effective and widely used method for displaying fingerprints. It uses the electrostatic adsorption (affinity) between powder and fingerprint sweat and oil to display, and has been used in many field surveys. Especially "gold powder" and "silver powder" have been the favorites of old technicians for a long time. However, with the enhancement of people's awareness of environmental protection, "gold powder" and "silver powder" are easy to fly and float and are inhaled by technicians to affect their health. They have strong adhesion, high viscosity, and are not environmentally friendly. The use of dust-resistant magnetic powder has basically replaced "gold powder" and "silver...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09B63/00A61B5/1171
CPCC09B63/005A61B5/1171
Inventor 王文江
Owner ZHEJIANG POLICE COLLEGE