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Unmasking Procedures Without the M256-Series Chemical Detector Kit

 

Unmasking Procedures Without the M256-Series Chemical Detector Kits. If an M256-series kit is not available, the unmasking procedures take at least 35 minutes. Find a shady area. Use M8/M9 paper to check the area for possible liquid contamination. When a reasonable amount of time has passed after the attack, the senior person should select one or two individuals. They take a deep breath, hold it, and break the seal for 15 seconds, keeping their eyes wide open. They then clear and reseal their masks and are observed for 10 minutes. If no symptoms appear, the selected individuals break the seal of their mask, take two or three breaths (keeping their eyes wide open), and clear and reseal their masks. Observe them for 10 minutes. If no symptoms appear, the selected individuals unmask for 5 minutes and then remask. If no symptoms appear in 10 minutes after remasking, the commander considers issuing a directive for an all-clear. This process takes a minimum of 35 minutes. Leaders continue to observe the selected personnel in case delayed symptoms develop.

Reference: Reference: FM 3-11.4