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ANALYSIS OF COMMONLY USED BLUE BALLPOINT PEN INK IN INDIA BY PLANAR CHROMATOGRAPHY.
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PubMed journal article: [Analysis of writing age of ballpoint pen ink by thin-layer The ballpoint pen ink spots were eluted in a solvent of isopropyl alcohol. Characterization and dating of blue ballpoint pen inks using principal component.
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
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and also if the date has been edited to display an older from the writing on The dyeing elements used in ballpoint pen ink c of crystal violet.
Paper Spray Mass Spectrometry for the Forensic Analysis of Black Ballpoint Pen Inks
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.
Characterization and Dating of Blue Ballpoint. Pen Inks Using Principal Component Analysis of UV–Vis Absorption Spectra, IR. Spectroscopy, and HPTLC.
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.
So these unfavorable factors all hamper the progress of this research work, therefore up to the present, still none accurately, method solves these problems reliably. At present, on definite ballpoint pen writing formation time problem, mainly there are two kinds of technology paths.
There are typically two different forensic methods for ink dating. With this method the forensic analysis determines the components in the ink, compares them against a library of standards and then allows an opinion regarding the first date that particular ink was manufactured commercially available. The dynamic approach is very useful in determining if a pen ink was placed on a document on its purported date, i.
There are only a handful of forensic scientists capable of performing these tests and laboratories equipped with the proper tools.
The study of aging of valuable documents is asked by the Forensic Medicine in Egypt. Eight ballpoint pens; commonly used in Egypt were chosen for this study.
Coding Guidelines for A Methodology for the User-needs Analysis an Pen-and-Ink Textures f Real-Time Pen-and-Ink Cert EN ball pen Rendering parametric s Bombing Suspect Faisal The Intelligent Pen—T Parametric Surface Ren Alonso a, R.
Dating of ballpoint pen ink
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The present invention relates to a ballpoint pen ink identification and creation time analysis system and method thereof, and more particularly, to identify and.
Brazilian Forensic Scientists are frequently asked about ballpoint pen manuscripts chronology in documents suspected to be forged. In the recent years, many methods like quantification of 2-PE 2-phenoxyethanol have been developed on this subject. The validation of these methods only recently has been a concern between scientific forensic community. Researchers studied the behavior of ink on ageing, but few of them concerned about the influence of the paper on the extraction of 2-PE.
The merit parameters evaluation showed that the method is linear, precise, accurate and robust. The results for the effect of paper showed main effects of the factors and the existence of interactions effects between the kind of paper and paper grammage, and between the kind of paper and other factors. Ink dating on questioned documents has been a great challenging on document examiners routine. Many official documents are forged using manuscripts with ballpoint pens and dated earlier than they really are.
Ageing processes of an ink follow complex paths that are considerably influenced by several factors other than time, which may accelerate or slow down the aging, like: i initial composition of the ink; ii physical and chemical properties of the substrate; iii storage conditions temperature, light, air flux, humidity etc. Volatile solvents in ballpoint inks are also used to assess the age of ink on paper. Solvent evaporation from ink on paper can be divided into an initial fast process, and after a few hours to days, the evaporation slows down and reaches a low, steady state.
Published works presented interesting ideas and promising orientations, but measurement errors are rarely mentioned in the literature. The analytical dating methods require a considerable amount of time and resources and it is important not underestimate the task of ensuring their scientific validity before implementing them in practice 1.