Illustration of a World War One soldier with a blue tint to his face, two days after being gassed with phosgene. The patient illustrated here showed symptoms of shallow respiration, frothy septum and a frequent cough. He later made a full recovery after being treated with oxygen being added to the air he breathed and being bled 15 ounces. Phosgene is a toxic, colourless, chlorine containing gas that disrupts gas exchange in the lungs, causing death from asphyxia. Phosgene was first believed to be used by the Germans at Ypres, Belgium in December 1915. This illustration was published in An Atlas of Gas Poisoning, 1918 by the American Red Cross. It was made as a guide for inexperienced officers in the American Expeditionary Force the characteristic injuries of different types of poisoning.