The Defense Technology® MK-9S OC Vapor delivers a high concentration of OC in a powerful mist. This inflames the mucous membranes and exposed skin resulting in an intense burning sensation. Onset is immediate and very intense. Whether exposure is in an open area or confined space, targets immediately focus on their own discomfort. Once moved from the contaminated area to fresh air, the respiratory effects resolve themselves in minutes. This formulation dissipates very quickly so residue is minimal.