What type of reagent is Physical Developer (PD)?

Physical Developer (PD) is classified as a silver-based reagent. This reagent is specifically designed for developing latent fingerprints on surfaces that have previously been treated with water or other aqueous solutions. The key component of Physical Developer is silver, which reacts with certain components present in the sweat residues left by fingers. This process enhances the visibility of the latent prints, allowing them to be documented or analyzed further.

By being silver-based, Physical Developer is particularly effective at revealing prints that may not be easily developed using other types of reagents, such as alcohol-based or water-based developers. Silver reacts with the fat and proteins in the latent fingerprints providing a contrasting color against the surface, making the prints stand out more visibly.