Question

What is the main component found in the "grey" powder used for fingerprint dusting?

• A. Carbon black
• B. Aluminum powder
• C. Zinc oxide
• D. Graphite

Hint:

{Grey fingerprint powder} mainly contains {graphite}. It is commonly used to develop latent fingerprints on dark-colored, non-porous surfaces.

Answer 1

The Correct Option is D

Concept: Fingerprint powders are used in forensic investigations to develop latent fingerprints on smooth, non-porous surfaces such as glass, metal, or plastic. These powders adhere to the moisture and oily residues left by the friction ridges of the fingers. Different types of fingerprint powders include:

• Black powder
• Grey powder
• Magnetic powder
• Fluorescent powder

Step 1: Understanding grey fingerprint powder.
Grey powder is commonly used on darker surfaces where black powder may not provide sufficient contrast.
Step 2: Identifying the main component.
The main component of grey fingerprint powder is graphite. Graphite particles adhere to the oily residues in latent fingerprints, making the ridge patterns visible for examination. Thus, the correct answer is: \[ \boxed{\text{Graphite}} \]