When the paper absorbs a drop of chemical warfare agent, it dissolves one of the pigments. Mustard agent dissolves a red dye and nerve agent a yellow dye. Detection paper can thus be used to distinguish between three different types of chemical warfare agents. A disadvantage with the papers is that many other substances can also dissolve the pigments. Consequently, detection papers should not be located in places where drops of solvent, fat, oil, or fuel can fall on them.
Drops of water cause no reaction.
The detection, identification, on-site evaluation, rendering safe, recovery, and final disposal of unexploded explosive ordnance. It may also include removal of explosive ordnance that has become hazardous by damage or deterioration. A false negative occurs when a chemical warfare agent detector falsely indicates that a chemical warfare agent is not present, even though the agent is present at a casualty producing concentration level. False positive A false positive occurs when a chemical warfare agent detector falsely indicates the presence of a chemical warfare agent. The Fox is a six-wheeled, light armored vehicle designed primarily for reconnaissance of liquid chemical warfare agent hazards.