Foren science (pen inks)

Foren science (pen inks) - Using Non-destructive Methods to...

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QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Using Non-destructive Methods to   Differentiate Black Ballpoint Pen Inks
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CHM 171.02 Elements of Forensic Science October 22, 2007 Many methods of handwriting and ink analysis are destructive. Derek Hammond though the use of non-destructive methods, is experimenting to see if he can differentiate 44 different ballpoint pen inks. For this experiment he used: the program Adobe® Photoshop® CS (Lab Color mode), and a Video Spectral Comparator – 4C (Infrared mode). In which the first is the test and the second is to verify the results using a known semi-non-destructive method. Hammond first took the 44 black ballpoint pens and made pen pair samples. These are pair’s contained two handwritten samples from each pen. There were 990 pairs, with one pen being pen X and the other being pen Y. Then “over the course of 2 months, approximately 40 pen pair samples were created per day and then set aside for [a] 24-72 h. [period]. Following the 1 – 3 day drying period, each sample was scanned at 300 pixels per inch (ppi) using a calibrated UMAX® Power Look 2100XL flat bed scanner.” 1 The images were then saved.
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