The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

摘要: Abstract The interaction of fingermark deposits on metals has been examined by a variety techniques. Visualisation film growth the main area investigation through: thermal oxidation, anodising, peroxide solution, and with vapour iodine ammonium sulphide. Corrosion underlying metal also as an alternative means visualisation. Confocal microscopy was used to look at thickness corrosion products around prints. Scanning electron energy dispersion X-rays (SEM-EDX) number samples investigate elemental distribution. observations suggest that differential oxidation occurring well into metal. Fingermark can corrode depending reactivity leave recoverable mark. However, alter rate chemical reaction substrate oxidation. In some cases organic matter inhibit reaction, both when forming oxide layer corroding signs third level detail from pore contact may be visible monovalent ions salts could influence growth. Whilst further work would need carried out decide whether any these techniques have application in recovery, this study does fingermarks after incidents such fires or immersion water.