Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. Sauzier curtin. This paper presents a study into the potential of visible spectroscopy with chemometrics as an approach to dating blue ball tip inks on paper documents. Analysis of six inks left under various conditions found that the majority of those kept in the dark could still be matched to the source pen after 32 months of ageing. Conversely, the majority of those exposed to light exhibited rapid spectral changes that continued throughout the 32 month period. Partial least squares regression PLSR was used to generate dating models for inks aged with exposure to light.
Dating of Documents
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Advances in the Forensic Analysis and Dating of Writing Ink [Richard L. Brunelle, Kenneth R. Crawford] on *FREE* shipping on qualifying offers.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Over the past 20 years, no other field of forensic science has had greater impact on the detection of fraudulent documents than the scientific examination of writing inks. This paper traces the development of ink dating techniques from the s to Techniques used during this period are described and, when possible, illustrated.
The emphasis is on ink dating techniques used today, with discussion of the value and limitations of these procedures. View PDF. Save to Library. Create Alert. Launch Research Feed. Share This Paper.
Ink Dating Expert Witnesses
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To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Minimum requirements for application of ink dating methods based on solvent analysis in casework Lancet, Minimum requirements for application of ink dating methods based on solvent analysis in casework. These methods follow the drying of solvents from ballpoint Received in revised form 21 January pen inks on paper and seem very promising.
However, several questions arose over the last few years Accepted 25 January among questioned documents examiners regarding the transparency and reproducibility of the Available online 4 March proposed techniques. These questions should be carefully studied for accurate and ethical application of this methodology in casework. Inspired by a real investigation involving ink dating, the present paper Keywords: discusses this particular issue throughout four main topics: aging processes, dating methods, validation Forensic sciences Questioned documents procedures and data interpretation.
Chemical Ink Dating
Expert witnesses who are available to consult and testify regarding ink dating may be found here. The consultants found through this page may provide reports on forged checks, signatures, questioned documents, ink analysis, and forensic ink dating, as well as expert witness testimony on these and related issues. You may limit your search for Ink Dating expert witnesses to a specific area by selecting a state from the drop down box. Featured Experts. Document examinations are provided in the following areas: handwriting, typewriter, photocopies, Global Forensic Services, LLC formerly Stewart Forensic Consultants, LLC is an independent laboratory and consulting firm providing investigation, forensic and litigation support to individuals, companies and firms.
Partial least squares regression (PLSR) was used to generate dating models for inks aged with exposure to light. Evaluation using an external test set found.
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Ink dating….and the CSI effect
The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent. Ink dating is a highly specialized forensic examination and considered to be one of the most accurate and reliable methods to help determine the age of a document. An ink formulation can be identified to a specific manufacturer to ascertain the first date of commercial availability.
If an entry is dated in , but the ink was not available until then the document could not have been created in
Ink Dating. There are four major approaches (each approach is a group of methods) used for dating inks on documents: 1. Ink Aging Approach. Various methods.
Ink Dating is done in two primary forms. The first ink dating method is the static approach, which determines when the ink being examined was manufactured. The second ink dating method is the dynamic approach, this method is to determine when the writing occurred, or in simple terms, how long the ink has been on the paper. The ink dating static approach is typically more useful as the difference between the date on the document and the present time increases. Several different tests exist in this form of ink dating.
These ink dating methods include the comparison of the examined ink to a known library of standards, commonly called the library approach, the detection of chemical date tags placed in the ink purposefully by the manufacturer, commonly called the date tag method, and also the determination of the type of ink writing instrument used. The determination of the type of writing instrument is probably the oldest method of ink dating. This ink dating method primarily involves microscopic examinations and can also incorporate some basic chemical solubility testing.
Some examinations can be performed on fountain pens to determine type of nib, type of ink and the first date of introduction of each of these. However, since this is a very small portion of the actual type of cases seen, we will concentrate primarily on more recent developments. Other pages discuss the use of infrared to discriminate the differences between inks that visually and microscopically look identical. The next step would be the most basic ink dating form of thin layer chromatography TLC testing to determine if two or more inks are the same or different formulations.
In order to do this the following steps are taken:.
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.
Chapter 8 INK DATING. Chapter 9 OTHER METHODS FOR DATING WRITING INKS. Chapter 10 EXPERIMENTS REGARDING THE EFFECTS OF INK.
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Ink and Paper Analysis / Trace Evidence / Questioned Document Examination
Based on these results, a general procedure for assessing the age of ballpoint pen inks on paper was developed. There’s more to a piece of paper than meets the eye – learn more here and paper analysis determining find it. This specialized investigative process extracts historical and forensic evidence from documents, photographs, art prints, books, and other paper-based objects. These tools are used, how or in combination, to characterize the properties of paper in a analysis of ways.
For example, a qualitative analysis shows what materials are in the paper, fiber, ink; quantitative analysis measures how much.
Each document was produced at different moments using a different ink stroke pressure, factors that may alter the results and lead to dating errors.
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