Question:
Sodium chloride present in latent fingerprints reacts with which of the following to produce visible prints?
Sodium chloride present in latent fingerprints reacts with which of the following to produce visible prints?
Updated On: Jan 7, 2025
- Grey powder
- Silver nitrate
- Ninhydrin
- Super glue
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The Correct Option is B
Solution and Explanation
Silver nitrate reacts with the sodium chloride present in sweat residues of latent fingerprints to form silver chloride. Upon exposure to ultraviolet light, the silver chloride darkens, making the fingerprint visible. This method is particularly useful on porous surfaces.
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