CN112940531B - Environment-friendly powder capable of displaying on-site fingerprints - Google Patents
Environment-friendly powder capable of displaying on-site fingerprints Download PDFInfo
- Publication number
- CN112940531B CN112940531B CN202110096297.6A CN202110096297A CN112940531B CN 112940531 B CN112940531 B CN 112940531B CN 202110096297 A CN202110096297 A CN 202110096297A CN 112940531 B CN112940531 B CN 112940531B
- Authority
- CN
- China
- Prior art keywords
- powder
- environment
- friendly
- metal salt
- azo pigment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000843 powder Substances 0.000 title claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000049 pigment Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 238000004040 coloring Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 210000004243 sweat Anatomy 0.000 description 7
- 238000012800 visualization Methods 0.000 description 5
- 239000006247 magnetic powder Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007794 visualization technique Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- -1 silver aluminum Chemical compound 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B63/00—Lakes
- C09B63/005—Metal lakes of dyes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Organic Chemistry (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention belongs to the field of material science and court science, and discloses environment-friendly powder for displaying on-site fingerprints. The invention is formed by mixing metal salt azo pigment and iron powder; grinding the metal salt azo pigment and the iron powder into powder of less than 8000 meshes, wherein the mixing mass ratio is 1: 0.5 to 2. The invention has the advantages that the powder substance is convenient to manufacture, has good display effect in the using process, has high coloring strength and vividness, is nontoxic and is more environment-friendly.
Description
Technical Field
The invention belongs to the field of material science and court science, and particularly relates to environment-friendly powder for displaying on-site fingerprints.
Background
The powder method for displaying the sweat latent fingerprints is a traditional effective and widely-applied fingerprint displaying method, is displayed by utilizing the electrostatic adsorption force (affinity) between powder and fingerprint sweat and oil, and is applied to a plurality of field surveys. Particularly, gold powder and silver powder are the favorite of old technicians for a long time. However, as the environmental awareness of people is enhanced, the gold powder and the silver powder are easy to fly and float, are sucked into the body by technicians to affect health, have strong adhesive force and large viscosity, are not environment-friendly, are more and more subject to the defects of the technicians and the like, and are difficult to fly and float, and the gold powder and the silver powder are basically replaced by the magnetic powder which is mainly used. The magnetic powder is a synthetic powder which is made of iron-containing magnetic substances and can be attracted by magnetic force, and is widely applied to the case field trace display due to the advantages of easy carrying, simple operation, high display rate, difficult floating, low toxicity and the like, so that the magnetic powder becomes a necessary tool for a field investigation box and is an important means for basic technicians to extract traces on site.
The fingerprint visualization technology is an important branch of court science, and through the development of hundreds of years, the technology has been developed into science integrating physics, chemistry, biology and optics, and the visualization technology is mature day by day. There are still a number of problems to be solved. Firstly, the method for showing a plurality of fingerprint samples with unsatisfactory objective conditions is yet to be perfected; secondly, the existing visualization reagent and visualization method still have potential safety hazards, such as small-particle dust suspended in the air when the brush visualization method is adopted, some fluorescent dyes with carcinogenic effect and toxic and harmful gas generated by substance decomposition reaction when the fuming method is adopted, which cause serious harm to the health of professional technicians. In addition, the use of certain colored agents can destroy the original state of the material evidence; some visualization reagents (such as DFO and the like) cannot be widely popularized in actual work due to high cost; some potential fingerprints that are inherently incomplete still need to retain their biological activity after visualization in order to perform extensive DNA testing and the like, which are problems that must be faced by forensic scientists.
Among the technical schemes currently used in China, for example, the application patents of Chinese geological university (Wuhan), application No. 201510054494.6, and the application No. 200910063215.7 applied by Hubei police college are all rare earth elements, and have the disadvantages of complex manufacturing process, relatively high cost and no environmental protection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method which is more environment-friendly and has more convenient production and manufacturing process, and can manufacture environment-friendly powder for showing the on-site fingerprints.
The invention is realized by the following technical scheme:
an environment-friendly powder for showing on-site fingerprints is an azo lake pigment with a molecular formula of C 27 H 17 N 3 O 8 S 2 Ba, also known as a metal salt azo pigment, contains one of a sulfonic acid group or a carboxylic acid group. The material is an organic pigment, in which the azo dye containing sulfonic group or carboxylic group reacts with metal ion to produce insoluble azo lake pigment with high coloring strength and brightness and no toxicity. Using fingerprint brush or soft brush to dip a little of the environment-friendly powder, flicking the brush handle to make the powder uniformly scattered on the surface of the object suspected of having the handprint,then flicking off the redundant powder on the brush, lightly brushing the surface of the object by using the brush tip to show the fingerprint outline, then brushing the fingerprint along the flow direction of the lines until the fingerprint is completely shown, and finally brushing off the redundant powder.
Preferably, the environment-friendly powder for showing the on-site fingerprints is characterized by being formed by mixing the metal salt azo pigment and iron powder; the metal salt azo pigment and the iron powder are ground into powder with the particle size of less than 8000 meshes, and the mixing mass ratio is
The iron powder is Fe 3 O 4 And (3) powder. Preferably, the mass ratio of the metal salt azo pigment to the iron powder is 1: 1, and mixing azo lake powder (purple, 8000 meshes) and iron powder (8000 meshes) which is mainly used as a carrier into novel magnetic powder. After the environment-friendly powder can be adsorbed by a special magnetic brush, the powder is lightly brushed at the position where the fingerprint is suspected, part of the powder of the fingerprint is adhered, and the scattered powder is sucked along the grain line flow direction by using a clean magnetic brush, so that the grain line is clear, the environment is protected, and the powder is not wasted.
Has the advantages that:
the powder substance of the invention is convenient to manufacture, has good display effect in the using process, has high coloring strength and vividness, is nontoxic and more environment-friendly.
Drawings
FIG. 1 shows a sweat fingerprint on clear glass, left for one day
FIG. 2A fingerprint of sweat on white PVC plastic plate
FIG. 3 sweat fingerprint left on clear glass for three days
FIG. 4A three-day sweat fingerprint left on white PVC plastic plate
FIG. 5 time-left three day sweat fingerprint on silver aluminum alloy
Detailed Description
The following detailed description of the invention is made with reference to the accompanying drawings:
example 1
First of all, manufactureAn environment-friendly powder for showing on-site fingerprints is formed by mixing metal salt azo pigment and iron powder; grinding metal salt azo pigment and iron powder into powder with the particle size of less than 6000 meshes, wherein the metal salt azo pigment is azo lake with the molecular formula of C 27 H 17 N 3 O 8 S 2 Ba; fully and uniformly mixing; wherein the mass ratio of the metal salt azo pigment to the iron powder is 1: 1.
example 2
The powder prepared in example 1 was used for the determination of the on-site handprints: and respectively making the left marks according to different places where the fingerprints are left and different left times.
Claims (2)
1. An environment-friendly powder for showing on-site fingerprints is characterized in that: the environment-friendly powder is formed by mixing metal salt azo pigment and iron powder; wherein the molecular formula of the metal salt azo pigment is C 27 H 17 N 3 O 8 S 2 Ba; wherein contains a sulfonic acid group; grinding the metal salt azo pigment and the iron powder into powder of less than 8000 meshes, wherein the mixing mass ratio is 1: 0.5 to 2; the iron powder is Fe 3 O 4 And (3) powder.
2. The environment-friendly powder for showing fingerprints on site as claimed in claim 1, wherein the mass ratio of the metal salt azo pigment to the iron powder is 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110096297.6A CN112940531B (en) | 2021-01-25 | 2021-01-25 | Environment-friendly powder capable of displaying on-site fingerprints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110096297.6A CN112940531B (en) | 2021-01-25 | 2021-01-25 | Environment-friendly powder capable of displaying on-site fingerprints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112940531A CN112940531A (en) | 2021-06-11 |
| CN112940531B true CN112940531B (en) | 2022-08-26 |
Family
ID=76236432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110096297.6A Expired - Fee Related CN112940531B (en) | 2021-01-25 | 2021-01-25 | Environment-friendly powder capable of displaying on-site fingerprints |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112940531B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6322868A (en) * | 1986-07-15 | 1988-01-30 | Toyo Ink Mfg Co Ltd | Azo pigment |
| JP2001265058A (en) * | 2000-03-15 | 2001-09-28 | Canon Inc | Method for manufacturing toner particle, magnetic toner and image forming method |
| JP2002129059A (en) * | 2000-10-25 | 2002-05-09 | Dainippon Ink & Chem Inc | Additive for pigment and azo-lake pigment composition |
| CN101082565A (en) * | 2007-07-06 | 2007-12-05 | 三峡大学 | Novel finger print developing reagent and developing method thereof |
| WO2010044393A1 (en) * | 2008-10-15 | 2010-04-22 | 大日精化工業株式会社 | Azo pigments, coloring compositions, coloring method and colored articles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1549714B1 (en) * | 2002-10-09 | 2008-10-29 | Ciba Holding Inc. | Method of colouring carrier materials |
-
2021
- 2021-01-25 CN CN202110096297.6A patent/CN112940531B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6322868A (en) * | 1986-07-15 | 1988-01-30 | Toyo Ink Mfg Co Ltd | Azo pigment |
| JP2001265058A (en) * | 2000-03-15 | 2001-09-28 | Canon Inc | Method for manufacturing toner particle, magnetic toner and image forming method |
| JP2002129059A (en) * | 2000-10-25 | 2002-05-09 | Dainippon Ink & Chem Inc | Additive for pigment and azo-lake pigment composition |
| CN101082565A (en) * | 2007-07-06 | 2007-12-05 | 三峡大学 | Novel finger print developing reagent and developing method thereof |
| WO2010044393A1 (en) * | 2008-10-15 | 2010-04-22 | 大日精化工業株式会社 | Azo pigments, coloring compositions, coloring method and colored articles |
Non-Patent Citations (4)
| Title |
|---|
| AROMATIC DIAZO AND AZO COMPOUNDS LXIVEW AMINO COMPOUNDS AND NEW AZO DYESBASED ON NAPHTO[2,I-d]OXAZOLE;Muzik, Ferdinand;《Scientific Papers of the University of Pardubice》;20111231;第85-96页 * |
| Efficacy of synthesized azo dye for development of latent fingerprints on Non-porous and wet surfaces;Bhagat, DS et al.;《MATERIALS TODAY-PROCEEDINGS》;20200908;第29卷;第1223-1228页 * |
| Fe3O4磁性纳米材料的绿色合成及其在潜指印显现中的应用研究;喻彦林 等;《刑事技术》;20160131(第1期);第57-61页 * |
| Muzik, Ferdinand.AROMATIC DIAZO AND AZO COMPOUNDS LXIVEW AMINO COMPOUNDS AND NEW AZO DYESBASED ON NAPHTO[2,I-d]OXAZOLE.《Scientific Papers of the University of Pardubice》.2011,第85-96页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112940531A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Staley et al. | Desert varnish: a biological perspective | |
| Baars et al. | The speciation of dissolved zinc in the Atlantic sector of the Southern Ocean | |
| Johnson | Interspecific associations in Pennsylvanian fossil assemblages | |
| Tang et al. | Copepod carcasses: occurrence, fate and ecological importance | |
| Ropret et al. | Applications of Raman spectroscopy in art and archaeology | |
| CN112940531B (en) | Environment-friendly powder capable of displaying on-site fingerprints | |
| CN111830034B (en) | Method for analyzing and counting organic matter microscopic biological composition in hydrocarbon source rock | |
| Mustoe | Biogenic weathering: Solubilization of iron from minerals by epilithic freshwater algae and cyanobacteria | |
| Dorn et al. | Rapid formation of rock varnish and other rock coatings on slag deposits near Fontana, California | |
| CN105411598A (en) | TiO2/C reinforced fingerprint appearing magnetic powder and preparation method and application thereof | |
| Bednarik et al. | Rock art dating in China: past and future | |
| CN103913477B (en) | The place of production authentication method of a kind of Taishan jade ranges | |
| CN105551360B (en) | A kind of rock and mineral component identification and analysis teaching experimental equipment | |
| Easton | Lichens and rocks: a review | |
| Mitchell | Foraminiferal assemblages from the late Lower and Middle Cenomanian of Speeton (North Yorkshire, UK): relationships with sea-level fluctuations and watermass distribution | |
| CN104965074A (en) | Rapid silver ion detection using label-free colloidal gold colorimetry, and detection kit | |
| Lawrence et al. | Aquatic biofilms: development, cultivation, analyses, and applications | |
| CN205333500U (en) | Modified geology laboratory analysis is with cold and hot platform | |
| CN106053570A (en) | Microcystic toxin-LR electrochemical detection method with amplified graphene signals | |
| Martino et al. | Bioremoval of Sulphate Layer from a 15th Century Polychrome Marble Artifact | |
| CN106175785A (en) | Use the modified stearic black magnetic fingerprint manifestation powder of Graphene and preparation thereof | |
| Marszałek | Application of optical microscopy and scanning electron microscopy to the study of stone weathering: a Cracow case study | |
| Dai et al. | Fossil bacteria in Xuanlong iron ore deposits of Hebei Province | |
| Xie et al. | Multiple geological events controlling rock types development: A case study of Wufeng-Longmaxi formation in southern Sichuan Basin, China | |
| CN1051327A (en) | Multi-coloured magnetic writing board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220826 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |