Abstract
ABSTRACT Polymerization of the volatile sulfur nitride S 2 N 2 can be brought about by interaction with latent fingerprint residues, with the resulting dark blue black polymer (SN) x visually developing the prints on a large range of media. Consideration of the technical and safety requirements of the technique allows an effective apparatus to be built and utilized with minimal risk. Observations on the diversity of media involv ed highlights the power of the technique, though results also indicate that no simple mechanism can accoun t for all aspects of the interactions be tween the nitride, the prints and the media surfaces. This is especially appare nt when prints on paper or plastic can s till be imaged after washing with either water or organic solvents; likewise prints on aluminium foil can be imaged even after being heated to 500 o C overnight. Keywords: Fingerprint, Sulfur Nitrides, (SN) x , Disulfur Dinitride, Polymer, Latent 1. INTRODUCTION We recently reported the unexpected observation that polymerization of S
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