- 01: Introduction
- 02: History
- 03: Propellants, Firearms, and Ammunition Development
- 04: Modern Firearms Manufacture
- 05: Small Arms Ammunition
- 06: Evidence Handling Procedures
- 07: Equipment and Instrumentation
- 08: Examination of Firearms
- 09: Cartridge and Shotshell Examination
- 10: Characterization and Evaluation of Fired Projectiles
- 11: Bullet Comparison and Identification
- 12: Gunshot Residue and Distance Determination
- Introduction
- Objectives
- AFTE Knowledge and Ability Factors
- Powders and Residues
- Examination
- Distance Determination
- Significance of Results
- Contact Shot
- Nitrite Residues
- Vaporous Lead Residues
- Residues Consistent with the Passage of a Bullet
- Residues Consistent with the Discharge of a Firearm
- Interpretation Challenges
- Reproduction of Results
- Nitrite Residue Patterns
- Shot Patterning
- Chemical Testing
- Shot Pattern Reproduction
- Selected Bibliography
- 13: Toolmark Identification
- 14: Communicating Results
- Resources
Reagents and Test Media
Home > Gunshot Residue and Distance Determination > Examination > Chemical Testing > Reagents and Test Media
Examples of reagents
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
- Prepare a 0.2 percent weight/volume solution of dithiooxamide in 100 percent ethanol.
- Store in a sealed container labeled according to laboratory protocol.
Ammonium Hydroxide Solution
- Prepare a 1:2 dilution of concentrated ammonium hydroxide using distilled or deionized water under a chemical hood.
- 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. |
