title: Dating the writing age of black roller and gel inks by gas chromatography and UV-vis spectrophotometer.
abstract: The relative and absolute age of roller and gel ink entries determined by gas chromatography (GC) and UV-vis methods are presented in this paper. The relative age of ink entries is concluded by the comparison of solvent amount between questioned and known dated entries. Absolute age of ink entries is estimated through the changing ratio of solvent components between heated and unheated samples without known samples for comparison. The methods are accurate and reliable.
authors.affiliation: Guangdong Police College, Department of Investigation, 500 Binjiangdong Street, Guangzhou, Guangdong 510232, PR China. xyy0123@163.com
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Jinghan
authors.initials: J
authors.lastname: Wang
authors.forename: Lijuan
authors.initials: L
authors.lastname: Yao