Journal Published Online: 01 September 1996
Volume 41, Issue 5

Thin-Layer Chromatography of Writing Inks—Quality Control Considerations



Quality control procedures for thin-layer chromotrography (TLC) are offered to increase reproducibility and dependability of results. During preparation of a TLC ink standard library, several types of inconsistencies were observed. Observations of more than 100 chromatograms of writing inks indicated the need for the institution of quality control procedures. Procedures were developed to ensure proper solvent selection, TLC plate selection, and proper photographic recording of TLC plates. Implementing quality control procedures in TLC enables the document examiner and forensic chemist to achieve these results.

Author Information

Lewis, JA
Wisconsin State Crime Laboratory, Milwaukee, WI
Pages: 4
Price: $25.00
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Stock #: JFS14015J
ISSN: 0022-1198
DOI: 10.1520/JFS14015J