Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies

An ethanol solution and surface metal technology, applied in the field of forensic science metal object trace identification, can solve the problems of criminal tools left behind, loss of identification value, low utilization rate of tool traces, etc., to protect property safety, facilitate promotion and use, and improve credibility. Effect

Inactive Publication Date: 2013-08-28
CHINESE PEOPLE'S PUBLIC SECURITY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, at the scene of a crime, it often happens that perpetrators deliberately leave criminal tools at the scene to avoid being attacked, so that the traces of the tools on the scene lose their appraisal value. is one of the reasons for the low utilization rate of tool traces in the field

Method used

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  • Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies
  • Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies
  • Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Using o-phenanthroline, rubophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, phenyl-2-pyridyl ketoxime to develop hand and face skin Remnants of the Upper Claw Hammer

[0037] (11) Weigh 10 mg of o-phenanthroline, bathophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, phenyl-2-pyridyl ketoxime, respectively Dissolve in 10ml ethanol solution, make four kinds of solutions of 1mg / ml, place in watering can A.

[0038] (22) Weigh 3g of ascorbic acid and dissolve it in 100ml of water to make a 3% (W / V) ascorbic acid solution and place it in watering can B.

[0039] (33) For the skin on the hands and faces where the claw hammer is held for more than 1 minute, first spray 0.1ml of the four solutions in watering can A (spray twice normally), and then immediately spray 0.05ml of solution B in watering can (spray once normally).

[0040] (44) Observe the effect after an interval of 1 minute. Under natural light, you can see the color of the contact part with ...

Embodiment 2

[0041] Example 2: Using o-phenanthroline, bathophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, and phenyl-2-pyridyl ketoxime to develop hand and face skin The imprint left by the upper round iron block

[0042] (11) Weigh 20 mg of o-phenanthroline, bathophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, phenyl-2-pyridyl ketoxime, respectively Dissolve in 10ml ethanol solution, make four solutions of 2mg / ml, place in four watering cans A respectively.

[0043] (22) Weigh 3g of ascorbic acid and dissolve it in 100ml of water to make a 3% (W / V) ascorbic acid solution, and place it in watering can B.

[0044] (33) For the skin on the hands and faces holding the iron block for more than 1 minute, first spray 0.1ml of the solution in the four watering cans A (spray twice normally), and then immediately spray 0.05ml of the solution in watering can B (spray once normally) .

[0045] (44) Observe the effect after an interval of 1 minute. Under natural light, you can see the...

Embodiment 3

[0046] Example 3: Using o-phenanthroline, bathophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, phenyl-2-pyridyl ketoxime to develop hand and face skin Imprint left over from stainless steel iron block

[0047] (11) Weigh 30 mg of o-phenanthroline, bathophenanthroline, 2,4,6-tris(2-pyridyl)-1,3,5 triazine, phenyl-2-pyridyl ketoxime, respectively Dissolve in 10ml ethanol solution, make four kinds of solutions of 3mg / ml, place in four watering cans A.

[0048] (22) Weigh 3g of ascorbic acid and dissolve it in 100ml of water to make a 3% (W / V) ascorbic acid solution, and place it in watering can B.

[0049] (33) For the skin on the hands and faces holding iron or stainless steel objects for more than 1 minute, first spray 0.1ml of the solution in the four watering cans A (spray twice normally), and then immediately spray 0.05ml of the solution in the watering can B (normal spray it).

[0050] (44) Observe the effect after an interval of 1 minute. Under natural light, you ...

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PUM

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Abstract

The invention relates to an ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies, and belongs to the technical field of metal object reserved mark authentication of the forensic science. The ethanol solution method includes dissolving 10mg-30mg of phenanthroline or 10mg-30mg of red phenanthroline or 10mg-30mg of 2, 4, 6-3(2-pyridyl)-1, 3, 5 triazine or phenyl-2-pyridyl ketoxime in 10ml of ethanol solution to prepare color developing agent solution with the concentration of 1mg / ml or 2mg / ml or 3mg / ml, and placing the color developing agent solution in a sprinkling can A; dissolving 3g of ascorbic acid in 100ml of water to prepare ascorbic acid solution with the concentration of 3% (W / V) and placing the ascorbic acid solution in a sprinkling can B; and sprinkling 0.1ml of the solution in the can A on the surface skin of a hand of a human body who holds an iron object or a stainless steel object by the hand for longer than 1 minute at the room temperature, then spraying 0.05ml of the solution in the can B on the surface skin of the hand, and fixing and photographing the surface skin of the hand in visible light after one minute. The ethanol solution method has the advantages of simplicity and convenience in operation, healthiness, environmental protection and perfect display efficiency, sensitivity, accuracy and repeatability.

Description

technical field [0001] The invention belongs to the technical field of identification of traces left by metal objects in forensic science, and in particular relates to a method for displaying traces left by metal objects on the surface of human skin by spraying reagents of ethanol solution. Background technique [0002] At present, with the continuous emergence of lethal imitation guns and the continuous improvement of perpetrators' anti-investigation awareness, in violent cases such as killing or wounding people with guns, robbery and other common cases of using iron tools for fighting, sabotage and theft, etc. In the process, it often happens that the extracted physical evidence will affect the follow-up inspection and identification due to its poor reflectivity. Even if the criminal suspect is found through investigative measures, if the suspect refuses to confess, the investigation of the case will be deadlocked. At this time, it is determined whether the criminal suspec...

Claims

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Application Information

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IPC IPC(8): A61B5/117
Inventor 杨瑞琴王丽婷
Owner CHINESE PEOPLE'S PUBLIC SECURITY UNIVERSITY
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