Fingerprint Light & Powder Methods

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Latent prints under light & powders

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Christa Grace D

India

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Froggy Jumps Fingerprint Light & Powder MethodsVersión en línea Latent prints under light & powders por Christa Grace D 1 Which light technique helps reveal latent fingerprints by casting oblique shadows on residues? a Direct overhead lighting b Oblique/side lighting c Infrared alone 2 What is the primary purpose of using fluorescent powders in print development? a To emit visible light under UV/alternate light b To scratch the surface c To absorb moisture 3 Which light wavelength is commonly used to excite fluorescent powders in fingerprint work? a 700 nm (red) b 1200 nm (IR) c 365–450 nm (UV-A/blue range) 4 Magnetic powders are particularly useful on which type of surface? a Porous or textured surfaces b Glossy plastics c Smooth metals 5 Which technique uses shortwave UV light to reveal latent prints with fluorescence? a Visible white light b Infrared reflectography c Alternate light source (ALS) with UV 6 In powder dusting, what is the function of using a tackifier or binder? a Colorize the print b Erase ridges c Help powder adhere to residues 7 Which property of fingerprint residues is most exploited by fluorescent powders? a Ink contamination b Fluorophore components in eccrine secretions c Metallic impurities 8 What is a common non-destructive method to visualize prints on non-porous surfaces? a Powder dusting with adhesive lifting b Sanding the surface c Chemical reagents only 9 Which visual aid enhances contrast when using black magnetic powder on dark surfaces? a Direct sunlight b Underwater illumination c Oblique lighting to highlight texture 10 What is a key safety consideration when applying powders and lights in fingerprint work? a Operate without PPE b Ignore ventilation c Avoid skin contact and monitor chemical exposure

Froggy Jumps

Fingerprint Light & Powder MethodsVersión en línea

Latent prints under light & powders

por Christa Grace D

Which light technique helps reveal latent fingerprints by casting oblique shadows on residues?

Direct overhead lighting

Oblique/side lighting

Infrared alone

What is the primary purpose of using fluorescent powders in print development?

To emit visible light under UV/alternate light

To scratch the surface

To absorb moisture

Which light wavelength is commonly used to excite fluorescent powders in fingerprint work?

700 nm (red)

1200 nm (IR)

365–450 nm (UV-A/blue range)

Magnetic powders are particularly useful on which type of surface?

Porous or textured surfaces

Glossy plastics

Smooth metals

Which technique uses shortwave UV light to reveal latent prints with fluorescence?

Visible white light

Infrared reflectography

Alternate light source (ALS) with UV

In powder dusting, what is the function of using a tackifier or binder?

Colorize the print

Erase ridges

Help powder adhere to residues

Which property of fingerprint residues is most exploited by fluorescent powders?

Ink contamination

Fluorophore components in eccrine secretions

Metallic impurities

What is a common non-destructive method to visualize prints on non-porous surfaces?

Powder dusting with adhesive lifting

Sanding the surface

Chemical reagents only

Which visual aid enhances contrast when using black magnetic powder on dark surfaces?

Direct sunlight

Underwater illumination

Oblique lighting to highlight texture

What is a key safety consideration when applying powders and lights in fingerprint work?

Operate without PPE

Ignore ventilation

Avoid skin contact and monitor chemical exposure

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Fingerprint Light & Powder Methods

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Fingerprint Light & Powder MethodsVersión en línea

por Christa Grace D

Which light technique helps reveal latent fingerprints by casting oblique shadows on residues?

What is the primary purpose of using fluorescent powders in print development?

Which light wavelength is commonly used to excite fluorescent powders in fingerprint work?

Magnetic powders are particularly useful on which type of surface?

Which technique uses shortwave UV light to reveal latent prints with fluorescence?

In powder dusting, what is the function of using a tackifier or binder?

Which property of fingerprint residues is most exploited by fluorescent powders?

What is a common non-destructive method to visualize prints on non-porous surfaces?

Which visual aid enhances contrast when using black magnetic powder on dark surfaces?

What is a key safety consideration when applying powders and lights in fingerprint work?

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