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Reagents and Test Media

Home > Gunshot Residue and Distance Determination > Examination > Chemical Testing > Reagents and Test Media
Chemical warning label, date, initials

Examples of reagents

Courtesy of Florida Department of
Law Enforcement, Tampa, FL

The following reagents and test media are required for the Dithiooxamide Test:

  • Dithiooxamide
  • Ethanol
  • Concentrated ammonium hydroxide
  • Distilled or deionized water
  • White filter paper
  • Known source of copper
  • Cotton swabs
  • Eye dropper bottle
Dithiooxamide Solution
  1. Prepare a 0.2 percent weight/volume solution of dithiooxamide in 100 percent ethanol.  
  2. Store in a sealed container labeled according to laboratory protocol.
Ammonium Hydroxide Solution
  1. Prepare a 1:2 dilution of concentrated ammonium hydroxide using distilled or deionized water under a chemical hood.
  2. Store in a sealed container labeled according to laboratory protocol.
Note:
There are numerous variations in the scientific literature for reagent strengths and the techniques for performing the Dithiooxamide Test.

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