[Differentiation of ballpoint pen inks by thermodesorption and gas chromatography-mass spectrometry].
Differentiation and classification of ink entries with dated samples of a reference collection are important aspects in the examination of questioned documents. Classification of writing inks is presently achieved by analysis of dyes and colorants contained in the ink. This technique has its limitations in newly developed ink formulations with identical dye composition but differing in their solvents and binder resins. This paper introduces a method for the determination of solvents and binder resins of an ink sample directly from paper without sample preparation. This aim is accomplished by thermodesorption of the sample followed by gas chromatography/mass spectroscopy. The method was tested on numerous samples of ballpoint pen inks, which were subsequently grouped into several solvent and resin subgroups. A case study shows the applicability of the newly developed method.
Bügler
Jürgen
J
Kriminaltechnischen Institut des Landeskriminalamtes München.
Buchner
Hans
H
Dallmayer
Anton
A
D000327:Adsorption; D002849:Chromatography, Gas / Q000379:methods*; D004282:Documentation; D005554:Forensic Medicine / Q000379:methods*; D005607:Fraud / Q000517:prevention & control*; D006236:Handwriting; D006358:Hot Temperature; D007281:Ink; D013058:Mass Spectrometry / Q000379:methods*