User:Suzi6165/Gunshot residue

Chemical Testing
The Sodium Rhodizonate test

To chemically test for the presence of gunshot residue, Color/Spot testing can be done. These are presumptive tests, not confirmatory tests, that are used to see if there is gunshot residue present on an area being tested. While color/spot tests can be used to test for gunshot residue, they are generally used more for to get an estimate of the distance a firearm was fired from. But they can be used for gunshot residue analysis if there is a need for a fast way to test for the possible presence of gunshot residue.

Some of these tests include the Dermal Nitrate/Paraffin test, the Walker test/Griess test, the Modified Griess test, the Harrison and Gillroy test, the Alizarin red S, the Sodium Rhodizonate test, Marshal and Tewari test, Lunge, and a Zincon reagent.

It is important to note that these tests are not specifically testing for gunshot residue, but rather elements or compounds that may be present. So there is a possibility of getting false positives when using any of these tests.
 * Dermal Nitrate/Paraffin test: test for the presence of Nitro groups
 * Walker test/ Griess test: tests for the presence of nitrites
 * Modified Griess test: tests for the presence of nitrites
 * Harrison and Gillroy test: tests for the presence of Lead (Pb), Barium (Ba), and Antimony (Sb)
 * Alizarin red S: tests for the presence of metal ions such as Calcium (Ca), Lead (Pb), or Barium (Ba)
 * Sodium Rhodizonate test: tests for the presence of Lead (Pb)
 * Marshal and Tewari test: tests for the presence of Nitrites
 * Lunge: tests for the presence of nitrocellulose
 * Zincon Reagent: tests for the presence of Zinc (Zn) and Titanium (Ti)