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Chemical Lifts in Forensic Science: Techniques and Applications

Explore the various types of chemical lifts used in forensic science, including iodine fuming, cyanoacrylate fingerprints, ninhydrin, and silver nitrate. Learn how these methods reveal crucial evidence and aid in investigations. Engage in hands-on activities to practice these techniques.

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Chemical Lifts in Forensic Science: Techniques and Applications

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  1. FORENSIC SCIENCEUnit 2BDay Four

  2. What are the types of chemical lifts? • Iodine fuming: iodine crystals are heated, sublimate • Adheres to the starch particles present in print • Results in bluish-black color

  3. Chemical lifts continued • Cyanoacrylate fingerprints: Superglue • Works best on nonporous surfaces • Glue sublimates and adheres to fingerprints • No one has conclusively determined why it works

  4. Chemical Lifts continued • Ninhydrin: chemical reaction occurs between amino acids present in perspiration • Results in purple-blue color • Ninhydrin reacts with any protein, so don’t get it on your skin!

  5. Chemical lifts continued • Silver Nitrate: sometimes the only method that works with older prints • Chloride ion in perspiration reacts to form silver chloride • Transformed by UV light into silver • Print shows up as black or reddish-brown

  6. Today’s Assignments AKA Justin Anderson is #1 • Due Today: Fingerprint Basics webquest and Fingerprint Flipbook • Chemical lifts- set up superglue print, complete iodine print and OMIT Silver nitrate print: TABLE 4 • Fingerprint powder one-pager activity: FRONT TABLE

  7. Journal 4 • Calculate the primary identification number for someone with the following print types. • Pinky fingers: right- arch; left- arch • Middle fingers: right- whirl; left- loop • Thumbs: right- whirl; left- whirl • Ring fingers: right- arch; left- loop • Index fingers: right- loop; left-loop

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