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NCJRS Abstract

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NCJ Number: 140922 Find in a Library
Title: pH Pen -- A Means of Comparing Paper Products
Journal: Journal of Forensic Sciences  Volume:38  Issue:1  Dated:(January 1993)  Pages:134-142
Author(s): R D Blackledge; M N Gernandt
Date Published: 1993
Page Count: 9
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: Printers can use a pH pen to test the alkaline/acid content of paper stock to determine if it will be compatible with a given printing ink, and the pH pen may be useful as an additional discriminator when questioned document examiners attempt to determine if two paper products (known and questioned) could have originated from a common source.
Abstract: In the current study, 68 different white paper products were compared using five different pH pen types. From 2,278 possible pairs, known and questioned, all but six pairs were discriminated by a combination of physical characteristics, fluorescence under ultraviolet light, and the pH pen. The authors point out that, as more mills change to alkaline paper production, the pH pen's ability to discriminate between different paper samples may decrease. 8 references, 5 tables, and 2 figures
Main Term(s): Document analysis; Paper analysis
Index Term(s): Criminal investigation; Evidence identification; Forensic sciences; Ink analyses; Ultraviolet techniques
Note: Paper presented at the Spring Meeting of the Southwestern Association of Forensic Document Examiners, 1991, San Diego, California
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