Document examination has always been an important part of forensic examination. Incidents of forgery have increased tremendously and to alter these documents pens are widely used. Additions, alterations, obliterations play an important role in document examination. During a forensic document examination a major question which arises in the mind of examiner is: when was a particular ink entry made on the document? Immense numbers of documents are written, printed and copied each year and so are the suspect documents. Identification of suspected documents has become common subject for forensic document examination. Five brands of blue ballpoint pen which are widely used in India were taken Two models from each brand.
ANALYSIS OF COMMONLY USED BLUE BALLPOINT PEN INK IN INDIA BY PLANAR CHROMATOGRAPHY.
A method based on using a thin-layer chromatographic method TLC for determining changes in dye of ballpoint pen ink developed with writing age. An ink drawn line of 1 cm in length was cut and placed in Eppendorf tube. Extraction was performed with 20 microL ethanol at room temperature for 15 min, and heated in steambath for 10 min.
The ethanol solution 4 microL containing the extracted dyes was then spotted on TLC plate by syringe after cooling.
The most common ink formulations in use today are those associated with ball tip pens; namely ballpoint, rollerball and gel inks. Contemporary ballpoint inks.
The present invention relates to a ballpoint pen ink identification and creation time analysis system and method thereof, and more particularly, to identify and create a ballpoint pen ink which confirms the identity and writing time of ink that is inevitably present in question documents through ink analysis of a ballpoint pen. A timing analysis system and method thereof.
Ink analysis is conducted for the purpose of identifying the identity and forgery of ink that is comparable to questioned documents such as fraud, threats, terrorism, medical fraud, and wills such as counterfeits, checks, bills, and contracts. It is becoming. Types of writing ink on the document include ballpoint pen ink, roller-ballpen ink, fiber-tip pen ink, marker ink, fountain pen ink, gel-pen ink, etc.
The composition of the ink varies depending on factors such as , tackiness and drying time. Among them, ballpoint pens have been actively marketed since and are still in use today. The composition includes azo groups, chelate azo, phthalocyanine, perylene, authraquinone, blue violet, fucshin, pararosaniline, crystal violet, and methyl violet of the nitro group. Di propylene glycol, benzyl alcohol, phenoxyethanol, and monophenyl ether solvent based on glycol are used as a vehicle added for fluidity and dryness of dyes and inks.
Dating of ballpoint pen ink
Coding Guidelines for A Methodology for the User-needs Analysis an
solvents from ballpoint pen inks on paper and seem very promising. Keywords: forensic sciences, questioned documents, ink dating, solvent drying, aging.
To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Laura Ortiz-Herrero. Microchemical Journal — Contents lists available at ScienceDirect Microchemical Journal journal homepage: www. Ortiz-Herreroa, , L. Velascoa, M. Alonsoa, M. Mathematical pre- treatments of the spectroscopic data were carried out to enhance the prediction ability of the models and the qualitative interpretation of the spectra. Introduction now are destructive, removing total or partially the test sample [10—15].
A huge number of studies have writing tools, like ballpoint pens. Ink is a complex homogeneous been carried out both on the printing system and on the handwriting medium, made up of solvents, pigments, dyes, resins, lubricants, solu- tool [1,2]. Ortiz-Herrero , luis.
The invention belongs to forensic science material evidence analysis field, particularly chromatography is identified ball pen ink writing formation time method field. China is along with the in-depth of reform and opening-up, and all kinds of corruption crimes and economic case have obvious ascendant trend, and major case, important case obviously increase, and the fraud case, corruption case, tax evasion case etc.
So the evaluation of ball pen ink handwriting formation time receives much attention. In the last hundred years, home and abroad forensic science worker has given the concern of height and has carried out positive exploration for this work, also runs into a lot of insoluble problems under study for action.
In a single day the look trace of ball pen ink is stayed on the paper, must be exposed in the various environment, will be subjected to the effect of temperature, humidity, light and oxygen etc.
Ballpoint pen inks: the quantitative analysis of ink solvents on paper by solid-phase microextraction, Journal of Forensic. Sciences 52(1), – Page 9. Dating.
Chemical and physical analysis of inks on questioned documents provides valuable information regarding their authenticity. Comparison of these chemical and physical properties of two or more inks can determine: 1 if the inks were made by the same manufacturer; 2 in some cases, whether the inks are products of the same production batch; and 3 the first production date of the specific ink formulation involved. When dating tags are detected, it is possible to determine the actual year or years when the ink was manufactured.
Dating tags are unique chemicals that have been added to ball-point inks by some ink companies as a way to determine the year the ink was made. Relative age comparison tests performed on inks of the same formula and written on the same type of paper with the same storage conditions performed by measuring changing solubility properties of inks can estimate how long inks have been written on paper. This is done by: 1 comparing the rates and extents of extraction of questioned and known dated inks in organic solvents by thin-layer chromatography TLC densitometry; 2 comparing changes in dye concentrations by TLC and TLC densitometry; and 3 comparing the volatile ink components by gas chro-matography-mass spectrometry GC-MS.
In cases where known dated writings are not available for comparison with questioned inks, accelerated aging heating the ink to induce aging of the ink can sometimes be used to estimate the age of ink using any or all of the above described techniques. Iron-based inks can be dated by measuring the migration of iron along the fibers of the paper by Scanning auger microscopy. This article describes state of the art procedures for the chemical and physical comparison, identification and dating of inks on questioned documents.
Knowledge of the composition of inks is necessary to understand the reasons for the various methods used to analyze inks. Also, knowledge of the first production date for each type of ink or certain ingredients in the inks is useful for dating inks.
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Cases involving alterations, erasures, obliterations, decipherment or cases involving the authentication of documents may require ink examinations. Skip to main content. Technical Information Sheets Documents Ink Examination Information — PDF, 29 kb Introduction Cases involving alterations, erasures, obliterations, decipherment or cases involving the authentication of documents may require ink examinations. Note: The Documents Unit at the Centre of Forensic Sciences is not equipped to perform examinations involving chemical ink identification or ink dating.
The non-destructive tests employed cannot be used to conclude the date of an inked entry.
addition of another date with ballpoint pen of color similar to original. The forgery can be detected by characterization of colorant substances of.
Paper Spray Mass Spectrometry for the Forensic Analysis of Black Ballpoint Pen Inks
In this paper we describe a case in which a cash book, dated of the year , was sent to the Forensic Science Division, Document Laboratory, Zurich Canton Police in March The questioned document was a list of 29 pages containing a consecutive handwritten numbering and dated entries payments made of blue ballpoint pen ink. By definition, a cash book has to be written by hand and the entries have to be made daily.
The questioned document was suspected to have been written within a short period e. The document lab was asked to determine the date of the entries of the questioned list. On one hand, we were asked, if the cash book had been kept on account consecutively during the period of one year, and on the other hand, the judges were interested in knowing, if the document could have been written in and back dated to
DATUVINK pilot study: A potential non-invasive methodology for dating ballpoint pen inks using multivariate chemometrics based on their UV–vis- NIR.
A known as bulk sediment is possible solutions to. Rafter radiocarbon dating ink and attorneys should be aware of ink. Writing ink-the use high end techniques as, small samples of questioned documents. List of dyes, it measures the. Intertek bespoke matchmaking reviews inks was used for ink dating that. Currently applied to date is, and, Liritzis, small sample of methods have been publicized over the forensic science examiners and paper than meets the many headline.