Electrochromic Enhancement of Latent Fingerprints on Stainless Steel Surfaces

摘要

The visualization of latent fingerprints on a metallicn(stainless steel) surface is described by means of spatiallynselective deposition of an electrochromic polymer (poly-naniline). Inhibition of electrochemical processes on areasnof the surface masked by the fingerprint results in polymerndeposition generating a negative image of the fingermark.nBy variation of the applied potential, the polymer opticalncharacteristics can be continuously and reversibly ad-njusted to optimize visual contrast of the fingerprint.