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Powder method for detecting latent fingerprints: a review
1Department of Chemistry, S.G.T.B. Khalsa College, University of Delhi, 110007, Delhi, India.
Forensic Science International
|July 28, 2001
Summary
The powder technique for latent fingerprint detection uses fine powders that adhere to sweat residue, making the ridge pattern visible. This method enhances the visualization of invisible fingerprints on various surfaces.
Area of Science:
- Forensic Science
- Trace Evidence Analysis
Background:
- Latent fingerprints are crucial in forensic investigations.
- Developing invisible fingermarks requires specialized techniques.
Purpose of the Study:
- To explain the mechanism of the powder technique for latent fingerprint detection.
- To highlight how powder adherence visualizes fingerprint ridge patterns.
Main Methods:
- Application of finely divided colored powder formulations.
- Utilizing brushes (e.g., glass-fibre, camel hair) for powder application.
- Mechanical adherence of powder to fingerprint sweat residue.
Main Results:
- Powder adheres to fingerprint ridges containing sweat residue.
- Powder does not adhere to furrow areas lacking residue.
- Differential adherence makes the ridge pattern visible.
Conclusions:
- The powder technique relies on mechanical adherence to sweat residue.
- Colored powders enhance visibility of developed latent prints.
- This method effectively visualizes latent fingerprints.