CN103263267A - Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies - Google Patents
Ethanol solution method for quickly displaying metal reserved marks on skin surfaces of human bodies Download PDFInfo
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- CN103263267A CN103263267A CN2013101586468A CN201310158646A CN103263267A CN 103263267 A CN103263267 A CN 103263267A CN 2013101586468 A CN2013101586468 A CN 2013101586468A CN 201310158646 A CN201310158646 A CN 201310158646A CN 103263267 A CN103263267 A CN 103263267A
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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
The invention belongs to forensic science metal object and leave over vestige authenticate technology field, particularly use the reagent sprinkling of alcoholic solution to manifest the method that human body skin surface metal object is left over trace.
Background technology
At present; along with the continuous appearance of the gun-simulation with lethality and improving constantly of perpetrator's counter-reconnaissance consciousness; the gun homicides or the case of violence such as hurt sb.'s feelings, plundered and use in the common cases such as the irony instrument is fought with weapons, destroyed, theft, usually there will be the material evidence extracted due to the bad situation that affect the subsequent survey evaluation of reflection property.Even found the suspect by investigative measures, if the suspect refuses explanation, by making the detection of case, have reached an impasse, now determine whether the suspect held irony object (gun, tool used in crime etc.), judge whether evidence at the scene has relatedness with the suspect and just become the key of processing this type of case.Therefore need the research worker in forensic science field constantly to weed out the old and bring forth the new, find and seek some new object of study as point of penetration, solve the focus and the difficulties that occur in the check evaluation.
According to the mass exchange principle of Edmund's Rocca moral, if perpetrator and metal object are contacted, will certainly on the metal object, stay perpetrator's fingerprint so; The skin surface contacted with instrument the perpetrator can stay impression and the trace meter composition of potential instrument contact simultaneously.Research worker has been carried out extensive and deep research in nearly 100 years for fingerprint, and the metal ingredient of the impression stayed for perpetrator's skin surface and trace is studied less.
Setting up the on-the-spot traditional method with perpetrator's relatedness of gunslinging case is bullet, the shell case that extracts criminal-scene, by leaving over superincumbent cartridge mark, infers the emission variety of gun, assert the emission gun; For the suspect who investigates out, by extract its on hand with the shooting residue (GRS) on wearing the clothes, organic principle and inorganic constituents are wherein tested, thereby judge whether it pulled the trigger bullet.The perpetrator washes one's hands or has changed clothes the clothes of wearing while committing a crime after crime, if it is not strong to the absorbability of shooting residue granule to extract the equipment of shooting residue, capital causes the content of the shooting residue that extracts to reduce, thereby occurs that the suspect pulled the trigger bullet but do not detect the situation of shooting residue.The traditional way of character (suicide, homicide or accident) of judging case is to carry out scene reconstruction by the position of shooting warhead, shell case, victim's wound, gun etc., dispute occurs if rebuild for scene the conclusion about case (or event) character of making, just will make the qualitative difficulty that becomes of case.Above situation, if utilizing colour reagent tests to suspect and the contacted skin surface of irony instrument (maximum is palmar aspect skin), not only operation is simple, and can confirm armed of armed people, armed mode and institute, significant for definite perpetrator and deduction case character (suicide, homicide or accident).
Often utilize the tool mark inference tools kind of appearance in scene of a crime, dwindle scope of investigation, and provide foundation for combining related cases.But because tool kind is numerous and diverse, when instrument when holding the trace object and contact, the influence factors such as angle of the position of its contact, amount of force, shape trace are more, and metamorphosis is larger, and therefore utilizing tool mark inference tools kind is that the check appraiser generally believes the comparison stubborn problem.In addition; in spot; often there will be artificial escape of crime to hit; deliberately guilty tool is retained in to scene; make on-the-spot tool mark lose the situation of appraisal value; so tool mark now can only be as the foundation of the part of combining related cases, this is undoubtedly one of tool mark reason that utilization rate is lower at the scene.If now investigate out some suspects, just can possess impression on the palm of instrument by colour reagent and suspect reacts, judge whether crime suspicion, and, by face shaping and the minutia of the instrument that displays on palm, inferred the kind of tool used in crime.The tool used in crime extracted for scene, can by handle part and suspect's palm of investigating out or the impression displayed on glove carry out comparison inspection, for directly assert that the perpetrator is significant.
Take the irony instrument as example, known by the mass exchange principle, in commit a crime course, the skin surface that the perpetrator contacts with tool used in crime can stay impression and the trace meter composition of potential instrument contact, therefore perpetrator and the contact site of irony instrument have the residue of ferrum, and the perspiration that residual ferrum can be touched position dissolves, and this transfer is mainly a kind of process of chemistry but not the transfer of mechanics merely, transfer of material is the mixture of ferrum, i.e. Fe, Fe
2+, Fe
3+mixture.Utilize colour reagent that it is displayed, and form aberration with the skin true qualities, thereby differentiated.
At present abroad about this research be mainly utilize reducing agent as ascorbic acid (vitamin C) by Fe
3+be reduced into Fe
2+, then utilize chemical reagent 3-(2-pyridine radicals)-5,6-diphenyl-1,2,4-triazine (PDT) reacts and generates complex [Fe (PDT) with ferrous ion
3]
2+, this kind of carmetta complex colour developing wavelength is positioned at 560nm, belong in visible-range, and colour stable, the people can directly observe under natural light, and the trace and the skin true qualities aberration that at skin surface, form are obvious, is easy to differentiate.Although this kind of method can manifest the skin print contacted with the irony object, but in experiment, general acetone or the methanol of adopting is as solvent, PDT is configured to the solution that concentration is 1mg/ml and sprays colour developing, even and if PDT is in acetone or methanol, dissolubility is not high yet, even the PDT solution of 1mg/ml also has a large amount of float, can not regulate as required the size of chromogenic agent, in addition, solvent toxicity is large, the production and application cost of PDT high (market price of PDT is 300 yuan of every grams), being not easy to basic unit promotes, simultaneously it shows rate and resolution also not high (being respectively 70% and 37%), therefore strive to find the alternative reagent of new " inexpensive ", make it not only can manifest the skin print contacted with the irony object, can also manifest the skin print contacted with other metal object, and this kind manifests than PDT the higher rate of showing arranged, resolution, cheap being easy to get of while, operation is simple, be convenient to promote to for current problem demanding prompt solution.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, propose a kind of human body skin surface metal and leave over the alcoholic solution method that impression manifests fast, the present invention adopts four kinds of agent prescriptions of alcoholic solution to manifest irony and the rustless steel object is left over trace, this method is easy and simple to handle, health environment-friendly, it is all more satisfactory that it manifests efficiency, sensitivity, accuracy and repeatability.
The first human body skin surface metal that the present invention proposes is left over the alcoholic solution method that impression manifests fast, it is characterized in that, specifically comprises the following steps:
1) take the Phen of 10mg-30mg, be dissolved in the 10ml alcoholic solution, the concentration chromogenic reagent solution that is made into 1mg/ml, 2mg/ml or 3mg/ml (can be selected variable concentrations as required, if it is long that trace is left over the time, perhaps object and gesture and facial expression contact skin time short, can select the developer of the 2mg/ml of large concentration or 3mg/ml to spray; On the contrary, select the developer of 1mg/ml), be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spraying A kettle solution 0.1ml( sprays twice), rear spray B kettle solution 0.05ml(sprays), behind 1 minute, interval, under visible ray, (observing contact site has color to show), taken pictures fixing to this gesture and facial expression skin.
The second human body skin surface metal that the present invention proposes is left over the alcoholic solution method that impression manifests fast, it is characterized in that, specifically comprises the following steps:
1) take the red phenanthroline of 10mg-30mg, be dissolved in the 10ml alcoholic solution, be made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml(spray twice), rear spray B kettle solution 0.05ml(sprays), 1 minute, interval, after observing contact site have color to show under visible ray, to this gesture and facial expression skin, taken pictures fixing.
The quick process for show of the human body skin surface metal impression of the third employing alcoholic solution that the present invention proposes, is characterized in that, specifically comprises the following steps:
1) take 2,4 of 10mg-30mg, 6-tri-(2-pyridine radicals)-1,3,5 triazines, be dissolved in the 10ml alcoholic solution, is made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, is placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml(spray twice), rear spray B kettle solution 0.05ml(sprays), 1 minute, interval, after observing contact site have color to show under visible ray, to this gesture and facial expression skin, taken pictures fixing.
The 4th kind of quick process for show that adopts the human body skin surface metal impression of alcoholic solution that the present invention proposes, is characterized in that, specifically comprises the following steps:
1) take the phenyl of 10mg-30mg-2-pyridine radicals ketoxime, be dissolved in the 10ml alcoholic solution, be made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml(spray twice), rear spray B kettle solution 0.05ml(sprays), 1 minute, interval, after observing contact site have color to show under visible ray, to this gesture and facial expression skin, taken pictures fixing.
The present invention has the following advantages:
1) the method has been developed four kinds of colour reagents that adopt alcoholic solution, can leave over trace to irony object on skin and manifests fast, has guaranteed high rate, the resolution showed simultaneously.
2) can regulate as required the concentration of agent prescription.Experiment showed, that four kinds of developer dissolvings in ethanol are fine, and solvent is ethanol, safety non-toxic.
3) process for show used in the present invention is direct spraying, simple to operate, but manifest the result naked eyes, directly observes, and process is easy, is easy to popularize.
4) preparation of the agent prescription of this method is simple, and use cost is lower, is convenient to promote the use of.
The flusher good portability, without extras.
5) carry out kind identification (as the face shaping of the pattern of pistol grip, tool used in crime and minutia etc.) even the same (while as the somewhere that the small of the stock occurs, occurring that the specific characteristic such as breach appears in damaged, tool used in crime) for the metal object all helpful; to the raising case-solving rate of case such as kill a person, kidnap, steal, fight with weapons; the protection people's property safety; the fright crime, the public credibility that improves the police produces active influence.
The accompanying drawing explanation
Fig. 1 is for adopting the inventive method to manifest the irony object---and claw hammer is left over the design sketch of trace on gesture and facial expression.Wherein a, b are respectively claw hammer and hold the figure of claw hammer, and c, d, e, f are respectively Phen, the red phenanthroline, 2,4 of 1mg/ml, 6-tri-(2-pyridine radicals)-1,3, and 5 triazines, phenyl-2-pyridine radicals ketoxime solution manifest design sketch.
Fig. 2 is for adopting the inventive method to manifest the irony object---and the round iron piece is left over the design sketch of trace on gesture and facial expression.Wherein a, b are respectively the figure of round iron piece and hand-held round iron piece, and c, d, e, f are respectively Phen, the red phenanthroline, 2,4 of 2mg/ml, 6-tri-(2-pyridine radicals)-1,3, and 5 triazines, phenyl-2-pyridine radicals ketoxime solution manifest design sketch.
Fig. 3 is for adopting the inventive method to manifest the design sketch that piece of stainless steel is left over trace on gesture and facial expression.Wherein a, b are respectively the figure of piece of stainless steel and hand-held piece of stainless steel, and c, d, e, f are respectively Phen, the red phenanthroline, 2,4 of 3mg/ml, 6-tri-(2-pyridine radicals)-1,3, and 5 triazines, phenyl-2-pyridine radicals ketoxime solution manifest design sketch.
The specific embodiment
Human body skin surface metal of the present invention is left over the alcoholic solution method that impression manifests fast, reaches by reference to the accompanying drawings embodiment and is described in detail as follows: following each embodiment is respectively and manifests the irony object---claw hammer, round iron piece and piece of stainless steel
?leave over trace on gesture and facial expression.As shown in Figure 1, 2, 3, wherein in Fig. 1, a, b are respectively claw hammer and hold the figure of claw hammer, and in Fig. 2, a, b are respectively the figure of round iron piece and hand-held round iron piece, and in Fig. 3, a, b are respectively rustless steel and hold the figure of piece of stainless steel.
Embodiment 1: adopt Phen, red phenanthroline, 2,4, and 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime manifest the trace of leaving over of claw hammer on gesture and facial expression skin
(11) take Phen, the red phenanthroline, 2,4 of 10mg, 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime, be dissolved in respectively in the 10ml alcoholic solution, is made into four kinds of solution of 1mg/ml, is placed in watering can A.
(22) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in watering can B.
(33), for holding the gesture and facial expression skin of claw hammer more than 1 minute, first spray respectively in watering can A the normal spray of four kinds of solution 0.1ml(twice), watering can B solution 0.05ml (normally spraying) immediately then.
(44) interval observing effect after 1 minute, under natural light, naked eyes can see that contact site has color to show, and to this gesture and facial expression skin, take pictures fixing.
Embodiment 2: adopt Phen, red phenanthroline, 2,4, and 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime manifest the trace of leaving over of round iron piece on gesture and facial expression skin
(11) take Phen, the red phenanthroline, 2,4 of 20mg, 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime, be dissolved in respectively in the 10ml alcoholic solution, is made into four kinds of solution of 2mg/ml, is placed on respectively in four watering can A.
(22) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution, be placed in watering can B.
(33), for holding the gesture and facial expression skin of iron block more than 1 minute, first spray respectively the normal spray of four solution 0.1ml(in watering can A twice), then spray immediately the solution 0.05ml (normally spraying) in watering can B.
(44) interval observing effect after 1 minute, under natural light, naked eyes can see that contact site has color to show, and to this gesture and facial expression skin, take pictures fixing.
Embodiment 3: adopt Phen, red phenanthroline, 2,4, and 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime manifest the trace of leaving over of rustless steel iron block on gesture and facial expression skin
(11) take Phen, the red phenanthroline, 2,4 of 30mg, 6-tri-(2-pyridine radicals)-1,3,5 triazines, phenyl-2-pyridine radicals ketoxime, be dissolved in respectively in the 10ml alcoholic solution, is made into four kinds of solution of 3mg/ml, is placed in four watering can A.
(22) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution, be placed in watering can B.
(33), for holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray respectively the normal spray of four solution 0.1ml(in watering can A twice), then spray immediately the solution 0.05ml (normally spraying) in watering can B.
(44) interval observing effect after 1 minute, under natural light, naked eyes can see that contact site has pink to show, and to this gesture and facial expression skin, take pictures fixing.
The display effect of the various embodiments described above is as shown in the c in Fig. 1,2,3, d, e, f, and c, d, e, f be Phen, red phenanthroline, 2,4 respectively, 6-tri-(2-pyridine radicals)-1,3, and 5 triazines, phenyl-2-pyridine radicals ketoxime solution manifest design sketch.
Claims (4)
1. a human body skin surface metal is left over the alcoholic solution method that impression manifests fast, it is characterized in that, the method specifically comprises the following steps:
1) take the Phen of 10mg-30mg, be dissolved in the 10ml alcoholic solution, be made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml, rear spray B kettle solution 0.05ml, interval, after 1 minute, under visible ray, is taken pictures fixing to this gesture and facial expression skin.
2. a quick process for show that adopts the human body skin surface metal impression of alcoholic solution, is characterized in that, the method specifically comprises the following steps:
1) take the red phenanthroline of 10mg-30mg, be dissolved in the 10ml alcoholic solution, be made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature,, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml, rear spray B kettle solution 0.05ml, 1 minute, interval, after observing contact site have color to show under visible ray, taken pictures fixing to this gesture and facial expression skin.
3. a quick process for show that adopts the human body skin surface metal impression of alcoholic solution, is characterized in that, the method specifically comprises the following steps:
1) take 2,4 of 10mg-30mg, 6-tri-(2-pyridine radicals)-1,3,5 triazines, be dissolved in the 10ml alcoholic solution, is made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, is placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature,, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml, rear spray B kettle solution 0.05ml, 1 minute, interval, after observing contact site have color to show under visible ray, taken pictures fixing to this gesture and facial expression skin.
4. a quick process for show that adopts the human body skin surface metal impression of alcoholic solution, is characterized in that, the method specifically comprises the following steps:
1) take the phenyl of 10mg-30mg-2-pyridine radicals ketoxime, be dissolved in the 10ml alcoholic solution, be made into the concentration chromogenic reagent solution of 1mg/ml, 2mg/ml or 3mg/ml, be placed in the A watering can;
2) take the 3g ascorbic acid and be dissolved in 100ml water, be made into 3%(W/V) ascorbic acid solution be placed in the B watering can;
3) at room temperature,, to holding irony or the rustless steel object gesture and facial expression skin more than 1 minute, first spray A kettle solution 0.1ml, rear spray B kettle solution 0.05ml, 1 minute, interval, after observing contact site have color to show under visible ray, taken pictures fixing to this gesture and facial expression skin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104545938A (en) * | 2015-01-14 | 2015-04-29 | 中国人民公安大学 | Quick field appearing and improving method for traces left on iron tool and galvanized tool |
| CN116311628A (en) * | 2023-05-23 | 2023-06-23 | 合肥智辉空间科技有限责任公司 | Method and system for detecting safety performance of intelligent door lock |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104545938A (en) * | 2015-01-14 | 2015-04-29 | 中国人民公安大学 | Quick field appearing and improving method for traces left on iron tool and galvanized tool |
| CN116311628A (en) * | 2023-05-23 | 2023-06-23 | 合肥智辉空间科技有限责任公司 | Method and system for detecting safety performance of intelligent door lock |
| CN116311628B (en) * | 2023-05-23 | 2023-08-11 | 合肥智辉空间科技有限责任公司 | Method and system for detecting safety performance of intelligent door lock |
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