Which fingerprint development method typically requires weeks for complete results?

The method that typically requires weeks for complete results is the Physical Developer. This technique is used for detecting latent fingerprints on porous surfaces, especially when the surfaces are wet or exposed to moisture.

Physical Developer is a water-based solution that works by reacting with the residual fatty acids and deposits left behind by finger contact. The entire process can be lengthy, involving multiple applications and drying times, and may require several weeks to achieve clear and complete results.

In contrast, the other methods, such as silver nitrate, ninhydrin, and cyanoacrylate, generally yield results much quicker. Silver nitrate can show results in a matter of hours, ninhydrin reveals prints usually within minutes to hours after application, and cyanoacrylate fuming can develop prints in a matter of hours as well. Therefore, the duration required for the Physical Developer sets it apart from the other fingerprint development techniques.