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It was difficult to guard against chlorpicrin in the War because none of the chemicals except charcoal in the gas-mask canister would remove it from the entering air.

Chlorpicrin is a lung injurant which incidentally causes vomiting, strangulation and temporary blindness.

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.

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

A violent reaction is set up and the chlorpicrin distils over, generally without the necessity for any external heating.