Development Of Fingerprint using Silver Nitrate method | Forensic Science | #forensicscience

Silver nitrate is a chemical reagent that has been used to develop fingerprints on porous items since 1877.4,9 Silver nitrate (AgNO3) reacts with the sodium chloride (NaCl) in the fingerprint deposits to form silver chloride (AgCl), which is a photosensitive compound. A photoreduction reaction converts the silver chloride to elemental silver.3 A solution of 1%–10% silver nitrate in distilled water is applied to the paper by brushing or dipping. The item is air-dried and exposed to long-wave UV radiation or sunlight until dark-colored fingerprints appear. Fingerprints must be photographed immediately as the background will continue to develop as it is exposed to light, decreasing the contrast over time.5 Due to its insensitivity, background staining, and tendency to deteriorate, the method is not commonly used today. #fingerprint #mesinabsensi #cctv #accesscontrol #fingerspot #smartlock #security #biometric #mesinabsensimurah #akseskontrol #zkteco #doorlock #technology #mesinabsen #absensikaryawan #cctvmurah #securitysystem #smartdoorlock #absensi #biometrics #smarthome #ipcamera #mesinabsensifingerprint #fingerprintmurah #accessdoor #digitallock #mesinkasir #hrdmantul #absensionline #facerecognition