is produced by exposing a mixture of carbon monoxide and chlorine gases to sunlight, and was used for “gassing” in the great war, being a suffocating and extremely poisonous gas. It is best produced by passing a rapid current of the mixed gases, at the ordinary temperature, over highly activated wood charcoal, the product being liquefied by use of a freezing mixture. The liquefied carbonyl chloride has a sp. gr. of i*43 at o degrees C., boils at 82 degrees C., and crystallizes at 128 degrees C. Petrol, benzol, and ethylacetate, dissolve an equal weight of the gas, and these solutions are used in the coaltar colour industry and for exterminating rats and moles.

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