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Effect of Temperature on the Visualization by Digital Color Mapping of Latent Fingerprint Deposits on Metal
Author(s) -
Peel Alicia,
Bond John W.
Publication year - 2014
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/1556-4029.12344
Subject(s) - hue , fingerprint (computing) , brass , visibility , copper , visualization , adobe photoshop , tin , materials science , chemistry , artificial intelligence , analytical chemistry (journal) , computer graphics (images) , metallurgy , computer science , optics , environmental chemistry , physics , software , programming language
Visualization of fingerprint deposits by digital color mapping of light reflected from the surface of heated brass, copper, aluminum, and tin has been investigated using Adobe ® Photoshop ® . Metals were heated to a range of temperatures ( T ) between 50°C and 500°C in 50°C intervals with enhancement being optimal when the metals are heated to 250°C, 350°C, 50°C, and 300°C, respectively, and the hue values adjusted to 247°, 245°, 5°, and 34°, respectively. Fingerprint visualization after color mapping was not degraded by subsequent washing of the metals and color mapping did not compromise the visibility of the fingerprint for all values of T . The optimum value of T for fingerprint visibility is significantly dependent of the standard reduction potential of the metal with Kendall's Tau (τ) = 0.953 ( p < 0.001). For brass, this correlation is obtained when considering the standard reduction potential of zinc rather than copper.