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A method for showing traces of occult blood and its special reagent

A trace, occult blood technology, applied in applications, biological testing, fluorescence/phosphorescence, etc., can solve problems such as affecting the display effect of fingerprints

Active Publication Date: 2022-02-25
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid Yellow will emit strong fluorescence after displaying blood-occult fingerprints [Jing Jingjing, Liu Wanpeng. Comparison of three methods of displaying blood-occult fingerprints on dark non-permeable objects[J]. Criminal Technology, 2014, 39(2):14-16] , suitable for displaying dark objects with no background fluorescence, but Acid Yellow requires three steps of fixation, dyeing and rinsing in the display operation. The background will be dyed during the handprint, which will affect the effect of the handprint

Method used

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  • A method for showing traces of occult blood and its special reagent
  • A method for showing traces of occult blood and its special reagent
  • A method for showing traces of occult blood and its special reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, displaying blood occult fingerprints on various objects

[0024] 1 Experimental method

[0025] 1.1 Reagents and instruments

[0026] Indandione powder, hydrogen peroxide, ethyl acetate, acetic acid, petroleum ether (Sinopharm Chemical Reagent Co., Ltd.), beaker, graduated cylinder, absorbent cotton, brown bottle, watering can, DCS-4 fingerprint enhancement system (UK Fast Company).

[0027] 1.2 Sample making

[0028] Nine kinds of objects were selected, including glass slides, black plastic bags, black ceramics, black painted surfaces, black leather, brown leather, black paper, red bricks, and cement bricks. A volunteer dipped in absorbent cotton to collect blood (human blood, 100% Concentration) smear on the index finger, wait for the blood on the index finger to dry, and then make a fingerprint on the object, and apply it evenly before each printing, try to keep the pressing pressure and the duration of the finger on the object the same. 10 blood-occ...

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Abstract

The invention discloses a method for displaying traces of occult blood and a special reagent thereof. The special reagent is composed of the following substances in mass percentage: indanedione 0.05-0.07%, ethyl acetate 45%-55%, acetic acid 1%-1.3%, petroleum ether 32%-40%, and mass fractions of 30% hydrogen peroxide solution 11%‑14%. Traces of occult blood can be visualized by using the above-mentioned special reagents. The method is simple and quick to operate, not only makes the trace display effect not affected by the background color, but also is suitable for displaying occult blood traces on permeable and non-permeable objects.

Description

technical field [0001] The invention relates to a method for displaying traces of occult blood and a special reagent thereof. Background technique [0002] Occult blood fingerprints are a kind of traces that often appear in crime scenes. It makes the suspect and the case have a high degree of correlation, and has a strong direction for the investigation and solution of the case. Therefore, timely and comprehensive discovery of blood-occult fingerprints left by criminal suspects and their clear appearance and extraction play an important role in solving cases. [0003] The traditional method of chemically showing occult blood fingerprints mainly contains two classes: a class is redox method, and main reagent has Tetramethylbenzidine [OLSEN R D.Sensitivity comparison of blood enhancement techniques[J].Ident.New, 1985,35( 8): 5-8], this reagent and blood or bloodstain generation oxidation-reduction reaction generates blue tetramethylbenzidine blue, thereby shows fingerprint; A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/58G01N21/64A61B5/1172
CPCA61B5/1172G01N21/6428G01N33/582G01N2021/6439
Inventor 薛静李孝君曲会英赵长幸刘寰马荣梁秦旗吴浩
Owner INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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