title: A new method of artificial latent fingerprint creation using artificial sweat and inkjet printer.
abstract: In order to study fingerprinting in the field of forensic science, it is very important to have two or more latent fingerprints with identical chemical composition and intensity. However, it is impossible to obtain identical fingerprints, in reality, because fingerprinting comes out slightly differently every time. A previous research study had proposed an artificial fingerprint creation method in which inkjet ink was replaced with amino acids and sodium chloride solution: the components of human sweat. But, this method had some drawbacks: divalent cations were not added while formulating the artificial sweat solution, and diluted solutions were used for creating weakly deposited latent fingerprint. In this study, a method was developed for overcoming the drawbacks of the methods used in the previous study. Several divalent cations were added in this study because the amino acid-ninhydrin (or some of its analogues) complex is known to react with divalent cations to produce a photoluminescent product; and, similarly, the amino acid-1,2-indanedione complex is known to be catalyzed by a small amount of zinc ions to produce a highly photoluminescent product. Also, in this study, a new technique was developed which enables to adjust the intensity when printing the latent fingerprint patterns. In this method, image processing software is used to control the intensity of the master fingerprint patterns, which adjusts the printing intensity of the latent fingerprints. This new method opened the way to produce a more realistic artificial fingerprint in various strengths with one artificial sweat working solution.
authors.affiliation: Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea. Electronic address: swhong524@naver.com.
authors.forename: Sungwook
authors.initials: S
authors.lastname: Hong
authors.affiliation: Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
authors.forename: Ingi
authors.initials: I
authors.lastname: Hong
authors.affiliation: Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
authors.forename: Aleum
authors.initials: A
authors.lastname: Han
authors.affiliation: Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
authors.forename: Jin Yi
authors.initials: JY
authors.lastname: Seo
authors.affiliation: Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
authors.forename: Juyoung
authors.initials: J
authors.lastname: Namgung
mesh_terms: D001372:Aza Compounds; D016287:Computer Peripherals; D003878:Dermatoglyphics; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007189:Indans; D007202:Indicators and Reagents; D007281:Ink; D007455:Iodine; D049449:Luminescence; D009555:Ninhydrin; D015203:Reproducibility of Results; D012835:Silver Nitrate; D013542:Sweat / Q000737:chemistry*; D015032:Zinc
chemical_list: C416542:1,2-indandione; C406982:1,8-diazafluoren-one; D001372:Aza Compounds; D007189:Indans; D007202:Indicators and Reagents; D012835:Silver Nitrate; D007455:Iodine; D009555:Ninhydrin; D015032:Zinc
keywords: Amino acid; Artificial latent fingerprint; Artificial sweat; Inkjet; Photoluminescence