This listing is for a single original unopened can of M-5 Type II liquid vesicant gas detecting paint, however four are available. Each still contains 4 fluid ounces. Three date to 9-10-42 and one dates to 3-11-42. This paint was commonly used by U.S. paratroopers as a method of camouflaging their helmets. When the normally brownish green paint would come into contact with chemical weapons it would turn pinkish red - warning the troops of the presence of gas. Although the contents are still liquid, we can make no guarantees regarding the functionality of the paint.