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Testing

Bi-chromatic Powder

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Bi-chromatic Powder

            Bi-chromatic powder does well on multi-colored surfaces. The surfaces that can be used to test Bi-chromatic powder include;

  • White backing card
  • Dark backing card
  • Paper
  • Untreated wood
  • Non-porous smooth surfaces such as plastic and glass
  • Non-porous rough services such as leather, vinyl and textured countertops
  • Adhesive tapes
  • Soda can
  • Computer paper
  • Painted wood
  • Unfinished wood

Most surfaces encountered during investigations are multi-colored. Investigators do not have prior knowledge of the color of the surface that they will find. However, the analysis of the collected evidence allows considering a variety of surfaces. The bi-chromatic powder is made using a combination of black and aluminum powder. The idea behind the use of black and aluminum powder is to make the powder usable on a variety of surfaces. Generally, the powder does well when tested on white and dark backing cards. Also, porous paper and untreated wood form a useful surface for testing bi-chromatic powder. Furthermore, the powder may be tested on non-porous surfaces such as the plastic and glass, which are smooth. However, the use of smooth surfaces does not outdo the effectiveness of non-porous rough surfaces such as leather and textured countertops. Exceptional conditions also exist in the testing of bi-chromatic powder where human skin, adhesive tapes, and blood prints are available for use. Generally, the bi-chromatic powder works perfectly on surfaces that would give misleading results if other powders were used. Besides, the bi-chromatic powder ensures that the marks left behind after lifting the prints are ridges that cannot provide misleading information. Furthermore, investigation using bi-chromatic powder is authentic and provides reliable results. Generally, the bi-chromatic powder is less selective on the number of surfaces to be tested.

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