forensicsworld

USING A LOGHT TABLE TO VIEW FINGERPRINTS ON GLASS:

A light table is a simple but highly effective tool in fingerprint examination, especially when working with transparent surfaces like glass. By illuminating the evidence from beneath, latent fingerprints become easier to detect, photograph, and analyse without excessive handling of the exhibit.

How it works:
When glass is placed on a light table, transmitted light passes through the surface and increases contrast between the fingerprint residue and the background.

Use when viewing…
• Natural latent prints
• Powder-developed fingerprints
• Cyanoacrylate fumed marks
• Smears and ridge detail not visible under normal lighting

Advantages:
-Enhances ridge detail visibility
-Assists photography and documentation
-Reduces glare and reflections
-Helps identify the best angle for examination

Suggestions and Tips:
-Always examine glass under multiple lighting conditions and angles
-Combine using a light table with oblique lighting, forensic light sources, or filters
-Use a clear plastic scale or ruler in your photos

Give a light table a try!

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LACERATION vs INCISION WOUNDS

Laceration

Caused by blunt force trauma
Examples: falls, assaults, vehicle collisions

Characteristics:

* Irregular or jagged edges
* Tissue bridging present
* Bruising/abrasion often surrounds the wound

Skin tears from impact.

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Incision

Caused by a sharp-edged object
Examples: knives, scalpels, glass

Characteristics:

* Clean, sharp, well-defined edges
* No tissue bridging
* Usually longer than deep
* Minimal abrasion or bruising at margins

Skin is sharply divided.

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Differentiating wound types helps forensic investigators determine:

* Type of weapon or force used
* Possible sequence of events
* Direction and mechanism of injury
* Whether injuries are accidental, self-inflicted, or assault-related

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In Summary…
Blunt force tears tissue → Laceration
Sharp force cuts tissue → Incision

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