What is cyanoacrylate fuming used for in latent fingerprint development?

• A. Fuming with cyanoacrylate creates polymer on residues to reveal latent prints on nonporous surfaces
• B. It dissolves oils to remove residues from prints on porous surfaces
• C. It stains prints using metal-based reagents
• D. It photographs prints without chemical treatment

Answer: (A)

Cyanoacrylate fuming works by exposing the item to cyanoacrylate vapor, which polymerizes when it contacts the fingerprint residues (oils, amino acids, moisture) left on the surface. This polymer creates a thin, durable white layer that outlines the ridge patterns, making latent prints visible and easier to photograph or lift. It’s particularly effective on nonporous surfaces like glass, plastic, and metal. It does not dissolve oils or remove residues, nor does it stain with metal-based reagents or allow prints to be photographed without any chemical treatment.