Advances in the forensic analysis and dating of writing ink
The process is automated, fast, and results can be stored electronically allowing the development of a searchable reference library.This process also detects non-dye additives in the ink that potentially can be used as identifiers. It helps to be a chemist when you're reading these articles.“Document related crimes are considered the most prevalent form of crime in society and the examination of ink and paper has been the focus of many criminal investigations,” the researchers said in their summary report.The traditional non-destructive methods for ink and paper examination, such as microscopic and optical techniques, are often insufficient to identify the inks used to prepare a document or to determine whether questioned pages originate from the same source, or if pages have be fraudulently replaced.The first dye peak (tm = 3.40 min, µep = –1.08 x 10–4 cm2V–1sec–1) agrees well with the µep and ultraviolet-visible spectrum of Rhodamine Base B, whereas the second peak (tm = 3.99 min, µep = –1.41 x 10–4 cm2V–1sec–1) agrees with the µep and spectrum of Crystal Violet."But everyone can appreciate the results and the possibilities for future applications. Capital Litigation Initiative: Crime Scene to Courtroom Forensics Training Webinars Capital Litigation Initiative: Crime Scene to Courtroom Forensics Training Live Seminars Forensic Science for Capital Litigators--Online Course--2014 Forensic Science for Capital Litigators--2009-2012 ABA Conference Digging Up Dirt on Experts DNA for the Defense Ethics Workshop Law 101: Legal Guide for the Forensic Expert Jamie D. The researchers also noted that as papers and inks are constantly being changed in the marketplace, document examiners have an increased interest in finding alternative and complementary methods of analysis.For instance, they said, gel pen inks have become a prominent type of ink in forensic document examinations but present a challenge because gel inks are difficult to analyze by conventional techniques. A total of 400 different types of ink were analyzed and more than 97 percent of writing inks and up to 100 percent of printing inks were correctly “discriminated” by the LIBS system.
A major focus of the project was to examine the effectiveness of LIBS in analyzing ink and paper.The ability of Laser Induced Breakdown Spectroscopy (LIBS) instruments to detect practically the entire periodic table of elements very quickly and without the complexity of other systems makes them an economic choice for forensic analysis.December 5, 2017The information from the forensic examination of inks and paper can be critical to investigations involving financial crimes, counterfeiting, terrorism, and anonymous letters used for threatening correspondences, ransom notes and kidnappings.the Secret Service's TLC library consists of ~8,500 inks).It's an important technique, however the process can't be automated.
Soil is another trace material that can be used to link suspects to a crime scene, although that was not a major focus of this research.