Ultra-violet Examination

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Technique Name:
Ultra-Violet Examination
Surface Used On:
Non-Destructive for all surfaces.
Sensitive To:
Absorption of U-V radiation.
Development Color: Method to Record: Hazard: Protective Clothing: Fume Hood Use:

N/A

2A Haze filter

Eye Damage

U.V.-Eye Protection

Not
Reagent Characteristics

Development Complete When:

Source of Error:

Incompatibilities:

Precautions:

Storage Container:

Safety:

Recommendations:


Similar Reagents



Sequential Reagents
(Not necessarily in this order.)



ULTRA-VIOLET EXAMINATION:
USED FOR:

A. Fluorescing fingerprint powders.
B. U-V sensitive dye stains.
C. Skin tissue examination.
D. Darkens blood impressions.
E. Fluorescing fluids for refrigerants,
   transmissions, fuels and coolants.
F. Luminesces backgrounds for 
   contrast improvement.

CENTERED WAVELENGTHS:

1. SHORT - WAVE
180 nm - 280 nm viewing. 

Oily, sweaty & contaminated
ridge detail viewing.
Luminol excitation.


2. MEDUIM - WAVE 
280 nn to 320 nm viewing. 

Bruises, Bite marks, & 
Wounds viewing.


3. LONG - WAVE 
320 nm to 400 nm viewing.

Used for examination of dye stains 
Ardrox, Basic Yellow 40 & T.E.C.
Fluoresces many natural and 
man-made substances.
PROCEDURE OF APPLICATION
A. Wear UV-absorbing 
protective eyewear.
B. Reduce ambient light.
C. Aim the U-V light. 
D. Photograph detail using
yellow or 2-A haze barrier fiters.



Ridge Detail Visualized by:

Ultra-violet light induced.


Reagent Applicabilities:

Porous sufaces
Non-Porous surfaces
Non-Destructive


Other Chemical Name(s):

U.V. light
"Black Light"
"Sun Lamp"
Far Ultra-violet
Near Ultra-violet
Middle Ultra-violet
UV-A
UV-B
UV-C


Process Summary:
A non-destructive technique to note the presence of visible detail. Several models of ultra-violet light sources are available that produce short-wave and long-wave (or both) lights. Detail is visualized either by turning darker upon absorbing ultra-violet light or by luminescing upon emitting ultra-violet light. Yellow or ultra-violet light blocking filters are used during photography of the detail.
Accepted Deviations:
Adjusting the wavelength of the ultra-violet light source may produce better visualization results.
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.

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