Capillary electrophoresis is also useful in ink analysis, which is becoming more important as more and more cases of counterfeiting of documents are detected using inkjet printers. Multiple inks can be chemically compared with each other to corroborate or refute whether the entries were created contemporaneously or produced over multiple periods of time. Questioned Document Examiners conduct questioned document analysis on various documents such as wills, ID cards, bank documents and much more. Analytical Techniques for Analysis of Heavy Metals By: Mohammad Ali Salik. Chromatographic methods Chemical analysis usually involves extraction of ink into appropriate solvents, which necessitates re-moving a fragment of a questioned entry from the sub-strate. Qualitative data coding . Chromatography - Chromatography - Methods: Chromatographic methods are classified according to the following criteria: (1) geometry of the system, (2) mode of operation, (3) retention mechanism, and (4) phases involved. as a means of ink comparison and high-performance liq-uid chromatography (HPLC) promises to offer even greater capabilities in the analysis of inks. Analysis. Does the ink from the “crime scene note” match any of the inks from the known pens? to determine if the questioned document is authentic or not. There are several types of chromatography; all types employ a mobile phase or eluent (it can be liquid or gas), which is forced through a stationary phase (a solid or semi-solid). Discussion of Results: The address ink is a different ink, the response of the c.r.d.s Pt. Thin-layer chromatography is the most widely used forensic technique for ballpoint pen ink examinations; however, limited information is obtained. This method starts a synchronous ink analysis operation. Ink analysis includes layout analysis, writing and drawing classification, and handwriting recognition. We give a sincere thank you to all who have reviewed papers for us since we launched: Click here to read our Reviewer Appreciation What other applications can we use chromatography for? These methods are considered “gold standard” analytical techniques for forensic analysis and have been extensively validated for producing prosecutorial evidentiary data. This involves scanning the ink with ultraviolet or infrared light to record its spectrum, that is, the wavelengths of light it absorbs. Inks contain chemical solvents that evaporate and generally go through a drying process that can last up to 2 years. R f values. In addition, several chromatographic and spectroscopic techniques are presently being evaluated for their application to ink examination. Ink Analysis. Some inks fluoresce, or emit light, on exposure to ultraviolet, while others disappear. A complex new dye was developed with a labile structure, and needed clarification to satisfy product launch criteria. There are typically two different forensic methods for ink dating. Forensic Document Examiners need to precisely record every step of the forensic document examination. Optical and chemical analysis can be conducted on paper to help establish if document fraud has been committed. 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). We applied direct analysis in real time mass spectrometry (DART MS) to ballpoint, gel, and fluid writing ink analysis. of a given ink, thus enhancing the process of forensic examination. This is because the spots in the brown ink are at the same heights (and have the same R f value) as the reference inks. Gel-based and printing inks are examples of inks that benefit from the development of laser-based methods. The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent.