Six donors, five male, one female, were chosen from ten participants because of their known ability within our laboratory to be good fingerprint donors, three for glass and three for metal. Participants depositedfingerprinชts on glass and metal exerting medium pressure. Their hands were washed prior to finger mark deposition. During the deposition of finger marks the contact time was between 3 and 5 s. Donors deposited three fingerprints on each glass and four fingerprints on each metal surface (both sides). The procedure took one hour as there were short intervals between each deposition