3. Techniques/Chemicals used to Devlop Prints

Silver Nitrate: This chemical is used to expose latent prints. This chemical is found in white and black photographic film. When silver nitrate is applied to a latent fingerprint, the silver nitrate interacts with the chloride found in fingerprint residue and forms silver chloride. The silver chloride reveals a black or reddish-brown fingerprint in the presence of ultraviolet light.

Sudan Black: This method develops fingerprints on a greasy or waxy non-porous surfaces such as glass, metal, interior of gloves, candles, and milk cartoons.

Zinc Chloride: This traditional method enhances prints on porous material after processing with Ninhydrin. Zinc Chloride is offered as a 1 liter solution in Methanol.

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