Which latent print development technique uses finely powdered lead?

The technique that uses finely powdered lead is X-Ray development. This method relies on the fact that lead powder can adhere to the oily residues left by fingerprints, allowing for the visualization of the print on various surfaces, including those that are difficult to examine with traditional methods.

X-Ray development is particularly useful in forensic science as it can reveal latent prints on surfaces that may otherwise not yield clear results. When X-Rays are applied after the lead powder has adhered to the print, they create a contrast that enhances the visibility of the fingerprint, which assists investigators in identifying individuals associated with the print.

Other techniques mentioned, such as superglue fuming and iodine fuming, apply different principles for developing prints. Superglue fuming involves vaporizing cyanoacrylate to adhere to the moisture in fingerprints, while iodine fuming relies on iodine crystals that sublime and bind to the oils in the print. Digital enhancement focuses on improving the quality of images using software rather than a physical development process.