What color does M-9 paper turn when it comes into contact with a nerve agent?

M-9 paper is a specialized detection tool used to identify the presence of liquid chemical agents, including nerve agents. When M-9 paper comes into contact with a nerve agent, it changes color to red. This color change indicates a positive reaction and signifies the presence of the chemical agent, allowing for appropriate safety measures to be taken.

The use of M-9 paper is crucial in environments where the risk of chemical attacks exists, as it provides a quick and visible indication of contamination. Proper identification helps ensure that personnel can respond effectively, limiting exposure and enhancing safety protocols.