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Developing Prints

Developing Prints. bsapp.com. 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. Fingerprints.

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Developing Prints

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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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