ISSN: 0022-1198
CODEN: JFSCA
Published Online: 1 March 2002
Page Count: 9

Extension of the Color Suite Available for Chemical Enhancement of Fingerprints in Blood
Caldwell, JP
WRONZ,

Kim, ND
WRONZ,

(Received 24 August 2001; accepted 17 August 2001)

Abstract

The use of ortho- and para-phenylenediamine (OPD & PPD respectively) for the enhancement of fingerprints in blood has been investigated. Optimal pH conditions and H²O² concentrations have been determined using UV/Vis spectroscopy. Both OPD and PPD are effective and less hazardous alternatives to the presently used 3,3'-diaminobenzidine (DAB) for the development of blood fingerprints, especially on porous surfaces. The orange color of OPD and the purple color of PPD offer alternative colors to the brown color of DAB and the light green color of ABTS for standing out against particular backgrounds. Both OPD and PPD can be used after ninhydrin treatment, but the reverse is not the case.

Keywords:
forensic science, blood, fingerprints, OPD, PPD, peroxidase, hemoglobin

Paper ID: JFS15253J
DOI: 10.1520/JFS15253J
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