CN103800015B - The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust - Google Patents
The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust Download PDFInfo
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- CN103800015B CN103800015B CN201410059253.6A CN201410059253A CN103800015B CN 103800015 B CN103800015 B CN 103800015B CN 201410059253 A CN201410059253 A CN 201410059253A CN 103800015 B CN103800015 B CN 103800015B
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Abstract
The present invention relates to the method adopting wax candle flue dust to smoke aobvious technology to manifest multiple object surface laten fingerprints, belong to fingerprint judging technique field.This method for mainly to manifest material with the wax candle of burning, utilizes candle ash and the difference of fingerprint paddy ridge region binding ability, manifests the laten fingerprints on multiple material (glass, pottery, metal, paper, fingerprint adhesive tape etc.) object surface.Specifically comprise: the smoked plating of candle flame enrichment flue dust laten fingerprints sample being placed in burning; Sample being shifted out flame and imposes external force makes conjugation relatively unstable paddy district candle ash come off, and leaves conjugation comparatively Gao Ji district candle ash; To take pictures fingerprint clearly with digital camera.The method is simple, fast, environmental protection, cost be low, and the most outstanding advantage is the laten fingerprints that can manifest the different object surface of multiple permeability, and without any need for the instrument and equipment of complexity or special reagent.Therefore, it is a kind of desirable real-time developing latent finger prints method that can be used for scene, has good using value.
Description
Technical field
The invention belongs to fingerprint judging technique field, relate to a kind of method that aobvious laten fingerprints smoked by wax candle flue dust.
Background technology
When finger contact object, the secretions that finger surface skin texture covers is corresponding residues in body surface, forms graph of a correspondence printing.Some is visible in these texture printing, some is difficult to the naked eye directly see, the latter is referred to as laten fingerprints, this kind of through health nature secretions as perspiration, oils and fats, the fingerprint lines that transfer is formed, visually not easily to find, usually need the method for physics or chemistry etc. to make it manifest or after strengthening again Information Monitoring apply.The discovery of science, extract, manifest fingerprint for security protection, safety check, criminal investigation, punishing crime has important practice effect.
In the history in fingerprint manifestation more than 100 years of research, smoked aobvious method is one of the most frequently used process for show, wherein mainly comprise iodine smoked aobvious, " 502 " glue is smoked aobvious.It is extensive that the smoked aobvious method of iodine is suitable for Object range, and the Sweat latent fingerprint for common permeability and impermeability object surface can show fast, and from 1880, since German's invention iodine fumigation, it occupied critical role always in judicial expertise.When crystal iodine is by heat sublimation, the iodine vapor contact finger mark residuals of purple, because polarity is similar and be dissolved in the oils and fats of residue, forms brown color finger mark streakline, thus is showed by latent.There is fixing difficulty, operation inconvenience, easily the shortcoming such as to fade in the smoked aobvious method of traditional iodine.The history that aobvious method also has thirties years smoked by " 502 " glue, the automatically smoked aobvious case of current Ministry of Public Security development, carried out quantification, standardization to multiple variable in smoked aobvious process.This method is highly sensitive, but the white polymer fingerprint shown on a lot of light color and color body and background reflectance more weak, not easily see clearly.Although there is research worker will combine the two (" 502 " glue adds iodine and exerts a gradual, corrupting influence on) the smoked aobvious light background imaging problem of fixing and 502 glue of exerting a gradual, corrupting influence on to solve iodine, also virtually add the complexity of operation.In addition, stifling iodine and 502 glue steam have certain toxicity, are also a kind of challenges to the health of site operation personnel.
The present invention is in order to overcome above-mentioned Problems existing, and invented a kind of scene in real time, health environment-friendly, with low cost and simple method rapidly, smokes aobvious fingerprinting by candle flame flue dust innovatively and be applied to manifesting of latent.The suprabasil latent different for the various permeability of light color efficiently, fast manifests, principle is the flue dust that wax candle imperfect combustion produces is finely ground particle substance, firmly being incorporated into fingerprint ridge line distinguishes in secretion, although start object entirety all by sooting, but exert a gradual, corrupting influence on candle ash with fingerprint ridge line secretions conjugation compared to firmly many with the conjugation on object surface, after flowing water (air-flow/hairbrush) punching (blow/brush) is washed, namely valley line region low conjugation candle ash is flushed away, only remaining in conjunction with firm crestal line region candle ash, thus laten fingerprints is displayed.
The wax candle flue dust that the present invention adopts is smoked aobvious, with low cost, be easy to operation, be suitable for Object range wide, the white carbon black produced in smoked aobvious process is firmly incorporated into laten fingerprints crestal line region, the black polymer fingerprint showed and the hard of object background, overcome the smoked aobvious shortcoming of smoking with " 502 " glue and showing and not being suitable for light object of easily fading of iodine, have good actual application value.
Summary of the invention
The object of the invention is: for simplicity, the feature of environmental protection, the real-time of fingerprint detection, low cost demand, the invention provides a kind of method utilizing candle combustion generation flue dust to smoke aobvious multiple object surface laten fingerprints.
Target of the present invention mainly provide a kind of simple, cheap, on-the-spot, in real time, fast, be suitable for Object range extensively, harmless to operator developing latent finger prints method.
The present invention adopts wax candle flue dust to smoke the laten fingerprints on the existing object surface of aobvious Faxian.The flue dust that this method utilizes candle combustion to produce and object surface and fingerprint ridge line region are in conjunction with the different principle of firmness, smoke at surveyed area and plate one deck flue dust, wash through flowing water (air-flow/hairbrush) punching (blow/brush), Gu Qu with rushed (blow/brush) without finger-print region white carbon black and fallen, crestal line region flue dust combines firmly residual more, thus manifests fingerprint and extraction of taking pictures.
The method concrete operations comprise the following steps:
A: the laten fingerprints being directed to the substrate surfaces such as glass, pottery, metal:
(1) get candle to light, the length of flame is about 3cm;
(2) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(3) level moves left and right sample, 2-3 time/s, continues 10-15s, or horizontally rotates sample 2 and enclose/s, continues 5s, collects flue dust;
(4) object is taken out from flame, by tap water or purging with nitrogen gas, clear fingerprint can be obtained.
B: be directed to moist paper business card substrate laten fingerprints:
(1) get candle to light, the length of flame is about 3cm;
(2) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(3) horizontally rotate test material 2 and enclose/s, continue 2-3s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 2-3s, collect flue dust;
(4) object is taken out from flame, rinse rapidly with tap water, clear fingerprint can be obtained.
C: be directed to stickiness substrate surface laten fingerprints:
(1) non-for adhesive tape adhesive surface side double faced adhesive tape is fixed on microscope slide, with keep test material smooth and and bubble-free between microscope slide, expose in be detected (stickiness face);
(2) get candle to light, the length of flame is about 3cm;
(3) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(4) horizontally rotate test material 2 and enclose/s, continue 1s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 1s, repeats 3-5 time, collection flue dust
(5) object is taken out from flame, with brush special, gently surface collection flue dust is brushed off, observe under the sample after showing is placed in black background, clear fingerprint can be obtained with hairbrush brush.
Advantage of the present invention is: utilize candle combustion generation flue dust to smoke the method for aobvious multiple object surface laten fingerprints, meet the simplicity of fingerprint detection, the feature of environmental protection, real-time and low cost demand, and it is wide, harmless to operator to be suitable for Object range, its the most outstanding advantage is the laten fingerprints that can manifest the different object surface of multiple permeability, and without any need for the instrument and equipment of complexity or special reagent.Therefore, it is a kind of desirable real-time developing latent finger prints method that can be used for scene, has good using value.
Accompanying drawing explanation
Fig. 1 is the present invention is illustrate the smoked aobvious laten fingerprints operational flowchart of meaning wax candle with substrate of glass.
Fig. 2 be the inventive method obtain manifest glass object surface laten fingerprints effect, be embodiment 1 effect simultaneously
Fig. 3 is the ceramic object surface oil developing latent finger prints design sketch that the present invention obtains.
Fig. 4 is the metal object surface oil developing latent finger prints design sketch that the present invention obtains, and is embodiment 2 effect simultaneously.
What Fig. 5 was that the present invention obtains is that embodiment 3 wets matter paper namecard effect.
Fig. 6 is the embodiment 4 stickiness object surface effect that the present invention obtains.
Detailed description of the invention
Further illustrate the present invention below in conjunction with example, this example only for illustrating, and is not limited only to practical ranges of the present invention.
Embodiment 1
Developing latent finger prints new method on a kind of wax candle flue dust smoked plating object, to remain the sheet glass of laten fingerprints, concrete operations have following steps:
1) get candle to light, the length of flame is about 3cm;
2) sheet glass detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
3) level moves left and right test material, 2 times/s, continues 10s, or horizontally rotates test material 2 and enclose/s, continues 5s, collects flue dust;
4) shifted out from flame by sheet glass, cooling for a moment, with tap water, can obtain clear fingerprint, take pictures.
Embodiment 2
Developing latent finger prints new method on a kind of wax candle flue dust smoked plating object, to remain the copper sheet of laten fingerprints, concrete operations have following steps:
1) get candle to light, the length of flame is about 3cm;
2) copper sheet detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
3) level moves left and right test material, 3 times/s, continues 15s, or horizontally rotates test material 2 and enclose/s, continues 5s, collects flue dust;
4) copper sheet is shifted out from flame, by purging with nitrogen gas, clear fingerprint can be obtained, take pictures.
Embodiment 3
Developing latent finger prints new method on a kind of wax candle flue dust smoked plating object, for the moist paper business card of residual laten fingerprints, concrete operations have following steps:
1) get candle to light, the length of flame is about 3cm;
2) by moist paper business card detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
3) horizontally rotate test material 2 and enclose/s, continue 2s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 2s;
4) business card is taken out from flame, rinse rapidly with tap water, clear fingerprint can be obtained, take pictures.
Embodiment 4
Developing latent finger prints new method on a kind of wax candle flue dust smoked plating object, to remain laten fingerprints police fingerprint extraction adhesive tape stickiness face, concrete operations have following steps:
1) the non-detection faces double faced adhesive tape of adhesive tape with laten fingerprints is fixed on microscope slide, to keep the smooth bubble-free of tape surface;
2) get candle to light, the length of flame is about 3cm;
3) by adhesive tape detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
4) horizontally rotate test material 2 and enclose/s, continue 1s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 1s, repeat aforesaid operations 4 times;
5) microscope slide is taken out from flame, use specific brush fingerprint brush, brush off surperficial flue dust gently, the sample after showing with hairbrush brush is taken pictures.
Claims (5)
1. the method for aobvious laten fingerprints smoked by a wax candle flue dust, it is characterized in that: with the wax candle burnt for mainly to manifest material, utilize the difference of candle ash and fingerprint paddy ridge region adhesion, manifest the laten fingerprints on multiple object, the substrate of object test material comprises glass, pottery, metal, moist paper business card and stickiness substrate, and detecting step is as follows:
(1) get the wax candle of a burning, by be detected for test material towards and perpendicular to flame, from flame 1/2nd level incision flame, and start smoked plating;
(2) move left and right test material with certain frequency level and carry out smoked plating a period of time, collect enough black candle ash;
(3) test material is taken out from flame, with tap water rinse rapidly, purging with nitrogen gas or hairbrush process, the apparent fingerprint of naked eyes can be obtained;
(4) take pictures with digital camera and gather the fingerprint image that manifested.
2. the method for aobvious laten fingerprints smoked by a kind of wax candle flue dust according to claim 1, and it is characterized in that: for the laten fingerprints of glass, pottery, metal substrate surface, concrete detecting step is as follows:
(1) get candle to light, the length of flame 2 ~ 4cm;
(2) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(3) level moves left and right test material, 2-3 time/s, continues 10-15s, or horizontally rotates test material 2 and enclose/s, continues 5s, collects flue dust;
(4) test material is taken out from flame, by tap water or purging with nitrogen gas, clear fingerprint can be obtained.
3. the method for aobvious laten fingerprints smoked by a kind of wax candle flue dust according to claim 1, it is characterized in that: for moist paper business card substrate laten fingerprints, concrete detecting step is as follows:
(1) get candle to light, the length of flame 2 ~ 4cm;
(2) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(3) horizontally rotate test material 2 and enclose/s, continue 2-3s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 2-3s, collect flue dust;
(4) test material is taken out from flame, rinse rapidly with tap water, clear fingerprint can be obtained.
4. the method for aobvious laten fingerprints smoked by a kind of wax candle flue dust according to claim 1, it is characterized in that: for stickiness substrate surface laten fingerprints, concrete detecting step is as follows:
(1) non-for adhesive tape adhesive surface side double faced adhesive tape is fixed on microscope slide, keep test material smooth and and bubble-free between microscope slide, expose to be detected;
(2) get candle to light, the length of flame 2 ~ 4cm;
(3) test material detection faces towards and perpendicular to flame, cut from flame 1/2nd level;
(4) horizontally rotate test material 2 and enclose/s, continue 1s, make a short pause and allow test material depart from flame, more again cut flame and horizontally rotate test material 2 and enclose/s, continue 1s, repeats 3-5 time, collection flue dust;
(5) test material is taken out from flame, with brush special, gently surface collection flue dust is brushed off, observe under the sample after showing is placed in black background, clear fingerprint can be obtained with hairbrush brush.
5. the method for aobvious laten fingerprints smoked by a kind of wax candle flue dust according to claim 1, it is characterized in that: described fingerprint pattern is oiliness laten fingerprints, antiperspirant laten fingerprints, or their mixture.
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| CN201410059253.6A CN103800015B (en) | 2014-02-21 | 2014-02-21 | The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust |
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| CN201410059253.6A CN103800015B (en) | 2014-02-21 | 2014-02-21 | The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust |
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| CN103800015B true CN103800015B (en) | 2015-08-12 |
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Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104939839B (en) * | 2015-05-18 | 2017-12-08 | 北京科技大学 | A kind of method for showing latent fingerprint using nitrocellulose filter and water |
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| CN103231477A (en) * | 2013-04-01 | 2013-08-07 | 王娇 | Preparation method of handprint model |
| CN103284728A (en) * | 2013-05-04 | 2013-09-11 | 中国科学院长春应用化学研究所 | Application of perylene derivative |
| CN103356199A (en) * | 2013-07-19 | 2013-10-23 | 北京科技大学 | Method for manifesting metal surface hidden fingerprints through chemical sedimentation |
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| WO2012018954A2 (en) * | 2010-08-03 | 2012-02-09 | Enamelite, Llc | Fingerprint system |
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| CN103231477A (en) * | 2013-04-01 | 2013-08-07 | 王娇 | Preparation method of handprint model |
| CN103284728A (en) * | 2013-05-04 | 2013-09-11 | 中国科学院长春应用化学研究所 | Application of perylene derivative |
| CN103356199A (en) * | 2013-07-19 | 2013-10-23 | 北京科技大学 | Method for manifesting metal surface hidden fingerprints through chemical sedimentation |
Non-Patent Citations (2)
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| The Detection and Enhancement of Latent Fingerprints;Chris Lennard;《13th INTERPOL Forensic Science Symposium》;20011019;85-98 * |
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Cited By (1)
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| CN106037754A (en) * | 2016-05-27 | 2016-10-26 | 江南大学 | Method for visualizing sebum latent fingerprints |
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