Tuesday, November 1, 2011

Latent Fingerprint Powder

3 Types of Brushes:
Zephyr Brush - Fine fiberglass filaments
Camel hair - cannot twirl
Squirrel Hair - cannot twirl

4 Basic Brush Strokes:

1. Painting - locates print with side to side motion
2. Swirling - circular motion with wrist
3. Twirling - Smaller circles by twisting brush between fingers
4. Dabbing - Straight into powder and then into the print


  • After putting tape over print, run an eraser over the tape to eliminate air bubbles obscuring the impression
  • Hold tape with both ends when lifting from a surface to prevent curling and sticking of loose tape
  • Always fold the torn tape end on the dispenser to save time peeling between each use
  • Huff onto the print if it needs moisture with your breath
  • Cut the loose ends of tape off of the fingerprint card and sign 1/2 on tape and 1/2 on the card to prevent forgery



Surfaces for fingerprint Powder
NON-POROUS surfaces: sliding glass door, automobile exteriors, counter-tops, t.v. sets, metal filing cabinets, painted doors, mirrors, broken glass, metal window frames, plastics, glass, metal, smooth surfaces and objects etc.

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