Restoration of stamp marks on steel components

Forensic Science International : Synergy
Graham Wightman, Jennifer Matthew

Abstract

Stamp marks are used as a unique identification for a range of items, but these can be erased for criminal activities. Erased marks can sometimes be recovered by etching or magnetic means. The present study looked at the application of Fry's reagent to recover erased marks from steel. The investigation also demonstrated that Fry's reagent can deteriorate on storing and will require a longer etching time. The effect of different applied forces of stamping was investigated, and the depth of the underlying deformation was determined by etching after varying degrees of metal removal. The amount of metal needing to be removed depends on the force applied to the die. Metal removal also affects the time needed for recovery. The underlying structural change remains as a hidden identification mark, and could potentially be used by manufacturers as an unseen identifier. A model for the underlying deformation is proposed.

Citations

Dec 15, 2010·Forensic Science International : Synergy·Norjaidi UliMohd Firdaus Che Amran
Dec 22, 2009·Forensic Science International : Synergy·Yeu Uei Bong, R Kuppuswamy
Aug 19, 2008·Forensic Science International : Synergy·Graham Wightman, Jennifer Matthew
Nov 8, 2006·Forensic Science International : Synergy·Mohd Azlan Mohd ZailiHafizah Harun
Oct 15, 2010·Forensic Science International : Synergy·Bert Weimar, Dirk Herrmann

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