When light reflects off a smooth surface we refer to this as specular reflection.
Alternate light source fingerprint.
All examples below are using the crimescope cs 16 500w.
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Red green orange pink yellow gold blue are the most common.
If we are fortunate enough that the print is on a smooth surface we start by holding the light source at a 45 degree angle.
Of all the classes of alternate light sources.
Finger and palm prints are nearly invisible on such metal surfaces when examined under room light.
But when viewed under a green light and observed through an orange filter the prints can easily be seen.
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Seminal fluid saliva and urine stains.
When light reflects off a rough surface we refer to it as diffused reflection.
Alternate light sources alternate light sources are typically used in crime scene investigation to identify many forms of evidence.
Also certain narcotics will fluoresce as will bone and teeth fragments.
Leds are lowest in price but also lowest in power and they lack versatility.
Let s go back to the example of the bloody fingerprint.
One use for alternate light sources is the examination of a weapon such as a gun or knife.
Physiological fluids semen urine and saliva can be identified through their natural fluorescent properties utilizing uv light.
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Although blood does not fluoresce certain other physiological fluids will.
Forensic light sources are high power.
Laboratory lasers are high power but also have the highest price and they lack versatility.
They are available in various colors.
Other uses of alternate light sources indeed many forms of physical evidence will fluoresce.