Forensic Science Week: Latent Print Examiner

Do you want to know how a latent print examiner pulls finger prints off of objects?
At the Hennepin County Sheriff's Office Forensic Science Laboratory detailed work is being done on a daily basis when it comes to finding fingerprint evidence and identification. Watch how examiners find those hidden prints on everything from a plastic bag to a cardboard box.

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Could you please explain me.. What are the components were mixed together for the white as well as black powders?