From verso of card: "During an air raid the safety of the citizen may depend to a considerable extent on his knowledge of how to behave. Splashings from the liquid liberated from certain gas-bombs, or subsequent contact with it, produce a serious blistering of the skin. . . . Prudent persons, if forced to go outside during raids, should provide themselves, in addition to a respirator with rubber or oilskin coats and hats, and rubber boots. Once these pieces of clothing have been exposed to gas, they should be decontaminated by boiling. It is important to remember that this reduces their gas-resisting properties."