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Advanced Methods for Developing Fingerprints: Techniques and Tools

Explore the latest techniques and tools for developing fingerprints, including dusting, iodine fuming, ninhydrin, and silver nitrate with UV-light. Learn about the theory behind each method and the appropriate surfaces to use them on. Discover the advancements in print developing that allow for increased visibility on various surfaces.

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Advanced Methods for Developing Fingerprints: Techniques and Tools

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  1. Developing Prints bsapp.com

  2. Fingerprints • Visible prints are made after coming in contact with colored material such as blood, paint, grease, or ink. • Plastic prints are ridge impressions left on a soft material such as putty, wax, soap, or dust. bsapp.com

  3. Fingerprints • Latent prints (invisible prints) are impressions caused by the transfer of body perspiration or oils present on the finger to the surface of an object. • Latent prints must be developed or made visible bsapp.com

  4. bsapp.com bsapp.com

  5. Dusting • Appropriate Surface: • Ridged/non-porous such as glass, plastic, or metal • Theory: • Dust will adhere to sweat & oils left behind bsapp.com

  6. Cover Surface With Dust bsapp.com

  7. Remove Excess Dust Brush or Blow bsapp.com

  8. Use Tape to Lift the Print bsapp.com

  9. Place Print on a Card bsapp.com

  10. Iodine Fuming • Appropriate Surface: • porous and non-porous such as paper, index cards, magazines, and cardboard. • Theory: • Sweat and oil will absorb iodine vapors bsapp.com

  11. Place the Object in an Enclosed Container with Iodine Crystals bsapp.com

  12. Print Should Develop in a Few Minutes bsapp.com

  13. Ninhydrin • Appropriate Surface: • porous such as paper, tissue, and clothing • Theory: • ninhydrin reacts with amino acids to form a purple compound bsapp.com

  14. Soak Suspected Surface with Ninhydrin Solution & Allow to Dry bsapp.com

  15. Print Should Develop Within 24 Hours bsapp.com

  16. Silver Nitrate & UV-Light • Appropriate Surface: • porous such as paper or drywall • Theory: • When exposed to ultra-violet (UV) light, silver nitrate reacts with the salt in sweat to form a blackish-brown compound bsapp.com

  17. Spray Surface With Silver Nitrate Solution bsapp.com

  18. Expose to UV-Light bsapp.com

  19. Print Should Develop in 5-10 Minutes bsapp.com

  20. Other Methods • In recent years, there has been much advancement in the area of print developing. Advanced brushes and new chemical procedures make it possible to develop prints on a larger variety of surfaces. • There are over a hundred different methods used to develop fingerprints, depending on the surface being examined bsapp.com

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