The visualization of latent fingerprints on a metallic (stainless steel surface is described by means of spatially selective deposition of an electrochromic polymer (poly- aniline). Inhibition of electrochemical processes on areas of the surface masked by the fingerprint results in polymer deposition generating a negative image ofthe fingermark. By variation of the applied potential, the polymer optical characteristics can be continuously and reversibly ad- justed to optimize visual contrast of the fingerprint.