M9 chemical detector paper turns to what color in the presence of nerve or blister agents?

M9 chemical detector paper is designed to provide a visual indication of the presence of chemical agents, specifically nerve agents and blister agents. When exposed to these types of chemical warfare agents, the M9 paper changes color to red.

The color change to red occurs because the chemical compounds in the agents interact with the indicators on the paper, triggering a chemical reaction that results in this specific color. This immediate color change is critical for personnel in a military setting, as it helps them quickly identify hazardous conditions and take appropriate action to protect themselves and their unit against chemical threats. Understanding the use of M9 paper in recognizing nerve and blister agents is essential for maintaining safety and readiness during a chemical warfare scenario.