|Surface Used On:
Non-Destructive for all surfaces.
Reflected & Absorbed lighting.
||Method to Record:
||Fume Hood Use:
Development Complete When:
Source of Error:
(Not necessarily in this order.)
VISUAL EXAMINATION FORMULA:|
PROCEDURE OF APPLICATION
A. Simple ambient light.
B. Absorbed light
(filter out background color).
C. Reflected light.
(for greasy impressions).
E. Directed light
(to subdue surface texture).
D. Oblique light
(for dust impressions).
E. Transmitted light
(on transparent surfaces).
Ridge Detail Visualized by:
Other Chemical Name(s):
A non-destructive technique to detect the presence of visible friction ridge detail. Several natural light sources and artificial sources
of light may be utilized in order to best visualize any friction ridge detail that is present. The angle of the light source is often
varied in an attempt to best visualize the subject.
Adjusting the source, angle, and illumination intensity may produce better visualization
results. Numerous lamps, colored filters, fiber optic guides, liquid light guides and
forensic light sources can be utilized.
Supporting Reference Materials:|
1. Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press,
Boca Raton, FL., 2001.
2. Manual of Fingerprint Development Techniques 2nd. Ed., Home Office - Police Scientific
Development Branch, White Crescent Press, Ltd., Luton, England, 2001.