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This gas was first used by the Germans late in 1915 and then adopted by the Allies, while the Germans switched to diphosgene which is less stable than its chemical brother but easier to fill into shells.

Chemistry's most spectacular contribution to World War I, apparently not yet used in World War II�chlorine, phosgene, diphosgene, chlorpicrin, diphenylchlorarsine, mustard�were all discovered in peace time by non-military scientists.

Of the lethal gases they learn that chlorine, phosgene and diphosgene attack a man's lungs, are soon blown away.

The poison gases: mustard, lewisite, ethyldichlorarsine, chlorpicrin, diphosgene, phosgene and chlorine.

The familiar Green Cross represented the slightly persistent, volatile, lethal compounds, such as phosgene and diphosgene.