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Silver Nitrate is the oldest known chemical
technique for fingerprint detection on porous
surfaces such as paper.
When you expose light to silver chloride (white in color) is decomposed to a silver metal, then a black image is porduced of the fingerprint.
What surfaces can silver nitrate be useful on?
Paper, cardboard, plastics, and unvarnished,
light-colored woods.
Silver Nitrate reacts with the chloride component of the latent fingerprint deposit to form a light sensitive silver chloride
By: Charles Wheeler