Development of latent fingerprints using a corona discharge.
J Forensic Sci
; 42(5): 833-41, 1997 Sep.
Article
em En
| MEDLINE
| ID: mdl-9304830
ABSTRACT
A novel technique for the development of latent fingerprints is presented. It is based on placing a fingerprint-bearing object inside a corona discharge induced plasma. The development of various real and artificial fingerprints on metallic substrates under a wide range of conditions is studied. Using the results of the development experiments and the results of X-ray photoelectron spectroscopy, it is shown that the development is based on oxidation of the fingerprint background. This is achieved by strong oxidizers generated by the discharge process, while saturated fatty-acids found in sebaceous fingerprints protect the area beneath them, resulting in a visible fingerprint. The process is optimized by minimizing the electrode gap distance and maximizing the peak discharge voltage and the pulse repetition frequency.
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Base de dados:
MEDLINE
Assunto principal:
Dermatoglifia
/
Medicina Legal
Limite:
Humans
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article