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Progress in Determining the Age of Writing Inks
WANG Cong-hui HU Xiu-feng (Institute of Forensic Science;Ministry of Public Security)
2001(2):
31-36.
The paper traces the development of determination methods for dating inks from the beginning of 1920s to the end of 1990s, It mainly includes the following parts .(1) Basic requirements to setup a new examination method for dating inks; (2) Working procedures for dating inks in questioned document examination, including the differentiation of the species of writing inks, visual examination of questioned documents, and finding of comparison samples with common brand, formula (and lot number if necessary); (3) Description and evaluation of the assorted methods used now in casework, such as the sulfate diffusion method, blotting method (contact-transfer method), dye ratio method, gas chromatography, solvent extraction method, differential scanning calorimetry etc; (4) Discussion of some new techniques hopeful to be applied in dating inks, such as the electrochemical method and spectrophotometric method for fountain pen inks, and the microspectro-photometric method, Fourier Raman spectroscopy method for ball-point pen inks.
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