M9 paper is used to detect which agents?

• A. Nerve and Blister agents
• B. Nerve agents
• C. Blister agents
• D. Blood agents

Answer: (A)

M9 paper is a field detection tool designed to rapidly indicate the presence of chemical agents on surfaces. It responds to two major classes of agents: nerve agents, which affect the nervous system, and blister (vesicant) agents, which cause skin and mucous membrane damage. That dual capability is why it’s the best choice for what M9 paper detects—covering both nerve and blister agents in a single test.

It’s not used to detect blood (cyanide) agents, which require different methods, so options limited to a single class or a different agent type don’t fit as well. In practice, you’d use M9 paper to screen surfaces or clothing suspected of contamination and then proceed with appropriate procedures if a color change is observed.