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NCJRS Abstract

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NCJ Number: 165765 Find in a Library
Title: Thin-Layer Chromatography of Writing Inks -- Quality Control Considerations
Journal: Journal of Forensic Sciences  Volume:41  Issue:5  Dated:(September 1996)  Pages:874-877
Author(s): J A Lewis
Date Published: 1996
Page Count: 4
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: This study by document examiners in Wisconsin's State Crime Laboratory System illustrated certain inconsistencies when using thin-layer chromatography (TLC) to analyze writing inks.
Abstract: Document examiners ran numerous TLC plates in preliminary work to establish a TLC standard ink library, and they compared chromatograms to gage the reproducibility of results. Because several deviations from the expected occurred, quality control procedures were developed. These procedures were developed to ensure proper solvent selection, TLC plate selection, and photographic recording of TLC plates. Implementing quality control procedures enabled document examiners to achieve reliable results from observations of more than 100 chromatograms of writing inks. 9 references, 1 table, and 2 figures
Main Term(s): Science and Technology
Index Term(s): Chromatography; Crime laboratories; Criminal investigation; Criminalistics; Criminology; Document analysis; Evidence identification; Forensic sciences; Ink analyses; Wisconsin
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