CN103417220A - Method for utilizing 502 glue and color developing agent to display latent fingerprints - Google Patents
Method for utilizing 502 glue and color developing agent to display latent fingerprints Download PDFInfo
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- CN103417220A CN103417220A CN2012101664496A CN201210166449A CN103417220A CN 103417220 A CN103417220 A CN 103417220A CN 2012101664496 A CN2012101664496 A CN 2012101664496A CN 201210166449 A CN201210166449 A CN 201210166449A CN 103417220 A CN103417220 A CN 103417220A
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Abstract
The invention provides a method for utilizing color developing agent 4,6-dichloro-5-pyrimidine formaldehyde and 502 glue to perform fuming so as to display latent fingerprints on the surface of an object. The technical scheme is that the method comprises the steps of well hanging the object with the latent fingerprints in a fuming box, heating a heater to a certain temperature, placing a mixture of the color developing agent and the 502 glue on the heater, and then sealing the fuming box. The color developing agent and the 502 glue serve as gas to be volatilized, polymerization occurs when the gas is met with the fingerprints, and the light yellow fingerprints are displayed. The method has the advantages of being simple, rapid and easy to operate and the like, the latent fingerprints on various different surfaces can be displayed, and the latent fingerprints on light-colored objects can also be displayed.
Description
Technical field
[0011] the invention belongs to a kind of Forensic Science showing trace method.
Background technology
It is variant that fingerprint has the people, throughout one's life the characteristics of constant and tactile thing trace.Therefore fingerprint plays the effect that the investigation clue is provided, solves a case and tries foundation in investigation, trial, is one of important evidence in criminal suit.Along with popularizing of computer technology and continually developing and applying of automatic system of fingerprint recognition, the application of fingerprint identification technology is more and more extensive.Therefore, the evaluation fingerprint is correctly found, extracts, manifested to science, for the investigation of the investigation of carrying out accident and processing, case, has important effect.
The appearing technique of fingerprint, through development for many years, has formed the several different methods that comprises physics, chemistry, optics etc. now.Such as: adopt golden nanoparticle one step to manifest laten fingerprints (CN 200910066558.9), zinc sulfide and zinc oxide nano-particle and manifest (CN 201010513980.7), highly basic-502 glue fingerprint fumigating and appearing method (CN200710014721.8) etc. for laten fingerprints.Wherein, 502 glue fumigating and appearing methods are one of prefered method manifested latent fingerprint on impermeability object surface (Forensic Science, 2002 (3): 5～8, Chinese law medical journal, 2007,22 (6): 366～368).502 glue are code names of a kind of binding agent.This binding agent be take the 2-cyanacrylate as main component, contains the polymerization inhibitors such as a small amount of hydroquinone and sulfur dioxide simultaneously.Why 502 glue can manifest colourless invisible fingerprints of sweat, are because main component 2-cyanacrylate monomer wherein has the existence of very strong electron-withdrawing group, and polymerization very easily occurs.Contain moisture and several amino acids in fingerprint sweat, after 2-cyanacrylate volatilization, under water and amino acid whose initiation, molecule aggregation can occur, finally form the polymer of solid, shaped and show fingerprint.Due to the polymer the formed tone that is creamy white, can form very high luminance contrast with the shade background, the effect of taking pictures is better.But, for the object on thin shade surface, fingerprint line and object surface are difficult to form contrast preferably, cause in such object photographs difficulty, need after-treatment.As further strengthened in conjunction with methods such as light, powder, dyeing, but after-treatment also may make fingerprint suffer damage.
Summary of the invention
It is smoked aobvious together with 502 glue that the present invention proposes a kind of use developer, thereby realize the method that object surface laten fingerprints is manifested.
The present invention's developer used is the chloro-5-pyrimidine of 4,6-bis-formaldehyde.Its structural formula is:
The present invention's 502 glue used are 502 commercially available glue, without further processing.
The weight ratio of the developer that the present invention is used and 502 glue is 1: 5 to 5: 1.
The heating-up temperature of the developer that the present invention is used and 502 glue is 150 ℃ to 250 ℃.
The present invention's developer fumigating and appearing method together with 502 glue used comprises the following steps:
[0009] 1, in smoked aobvious case, hang up properly the object of tool laten fingerprints, after heater is heated to certain temperature (150 ℃ to 250 ℃), the mixture of developer and 502 glue (weight ratio of developer and 502 glue is 1: 5 to 5: 1) is put on heater, then will smokes aobvious case sealing.
2, developer and 502 glue are as gaseous volatilization, and gas runs into fingerprint generation polymerization, shows flaxen fingerprint.
The present invention has following advantage:
1, method is simple, quick, easy to operate, can manifest the laten fingerprints of various different surfaces, on light object, also can realize manifesting of laten fingerprints.
2, not by instrument (bore hole observation) can identify and manifest laten fingerprints; All manifesting fingerprint and can directly taking pictures and fetch data under natural light of obtaining.
3, the present invention easily prepares and preserves; Cost is low, and during use, consumption is few.
4, the fingerprint image retention time that the present invention manifests is long.
The accompanying drawing explanation
Accompanying drawing 1, smoked aobvious together with 502 glue for using developer, the image of glass surface laten fingerprints.
Accompanying drawing 2, smoked aobvious together with 502 glue for using developer, the image of blank sheet of paper surface laten fingerprints.
The specific embodiment
Embodiment 1: in smoked aobvious case, hang up properly the slide of tool laten fingerprints, after heater is heated to 200 ℃, by 0.1 gram 502 glue and 0.1 gram 4, the mixture of the chloro-5-pyrimidine of 6-bis-formaldehyde is put on heater, then will smoke aobvious case sealing.Take out slide after 10 minutes, can be observed fingerprint ridge clearly.(accompanying drawing 1)
[0018] embodiment 1: in smoked aobvious case, hang up properly the virgin paper sheet of tool laten fingerprints, after heater is heated to 200 ℃, by 0.15 gram 502 glue and 0.3 gram 4, the mixture of the chloro-5-pyrimidine of 6-bis-formaldehyde is put on heater, then will smoke aobvious case sealing.Take out virgin paper sheet after 10 minutes, can be observed fingerprint ridge clearly.(accompanying drawing 2)
Claims (6)
1. one kind is used developer smoked aobvious together with 502 glue, thereby realizes the method that object surface laten fingerprints is manifested.
2. method according to claim 1, developer is the chloro-5-pyrimidine of 4,6-bis-formaldehyde.Its structural formula is:
3. method according to claim 1,502 glue are 502 commercially available glue, without further processing.
4. method according to claim 1, the weight ratio of developer and 502 glue is 1: 5 to 5: 1.
5. method according to claim 1, the heating-up temperature of developer and 502 glue is 150 ℃ to 250 ℃.
6. method according to claim 1, developer fumigating and appearing method together with 502 glue comprises the following steps:
(1) in smoked aobvious case, hang up properly the object of tool laten fingerprints, after heater is heated to certain temperature (150 ℃ to 250 ℃), the mixture of developer and 502 glue (weight ratio of developer and 502 glue is 1: 5 to 5: 1) is put on heater, then will smokes aobvious case sealing.
(2) developer and 502 glue are as gaseous volatilization, and gas runs into fingerprint generation polymerization, shows flaxen fingerprint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101664496A CN103417220A (en) | 2012-05-18 | 2012-05-18 | Method for utilizing 502 glue and color developing agent to display latent fingerprints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101664496A CN103417220A (en) | 2012-05-18 | 2012-05-18 | Method for utilizing 502 glue and color developing agent to display latent fingerprints |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103417220A true CN103417220A (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101664496A Pending CN103417220A (en) | 2012-05-18 | 2012-05-18 | Method for utilizing 502 glue and color developing agent to display latent fingerprints |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107629784A (en) * | 2017-09-06 | 2018-01-26 | 深圳先进技术研究院 | A kind of developer and preparation method thereof and a kind of fingerprint manifestation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088076A (en) * | 1992-12-18 | 1994-06-22 | 丛吉升 | Display method of finger prints on rough object |
| US6306662B1 (en) * | 1999-02-04 | 2001-10-23 | Texas Tech University | Fingerprint development methods |
| CN101038244A (en) * | 2007-04-29 | 2007-09-19 | 新泰市公安局 | Alkali-502 glue fingerprint fumigating and appearing method and fumigating and appearing box |
| US20100047433A1 (en) * | 2006-10-06 | 2010-02-25 | Toagosei Co., Ltd | Polymer for detecting fingerprint, method of producing the same, composition for detecting fingerprint and method of detecting fingerprint using the same |
| CN201469276U (en) * | 2009-08-20 | 2010-05-19 | 杜心全 | Multifunctional handprint displaying device |
-
2012
- 2012-05-18 CN CN2012101664496A patent/CN103417220A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088076A (en) * | 1992-12-18 | 1994-06-22 | 丛吉升 | Display method of finger prints on rough object |
| US6306662B1 (en) * | 1999-02-04 | 2001-10-23 | Texas Tech University | Fingerprint development methods |
| US20100047433A1 (en) * | 2006-10-06 | 2010-02-25 | Toagosei Co., Ltd | Polymer for detecting fingerprint, method of producing the same, composition for detecting fingerprint and method of detecting fingerprint using the same |
| CN101038244A (en) * | 2007-04-29 | 2007-09-19 | 新泰市公安局 | Alkali-502 glue fingerprint fumigating and appearing method and fumigating and appearing box |
| CN201469276U (en) * | 2009-08-20 | 2010-05-19 | 杜心全 | Multifunctional handprint displaying device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107629784A (en) * | 2017-09-06 | 2018-01-26 | 深圳先进技术研究院 | A kind of developer and preparation method thereof and a kind of fingerprint manifestation method |
| CN107629784B (en) * | 2017-09-06 | 2019-11-05 | 深圳先进技术研究院 | A kind of developer and preparation method thereof and a kind of fingerprint manifestation method |
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Application publication date: 20131204 |