Blue Cross (chemical warfare)

Blue Cross (Blaukreuz) is a World War I chemical warfare agent consisting of diphenylchloroarsine (DA, Clark I), diphenylcyanoarsine (CDA, Clark II), ethyldichloroarsine (Dick), and/or methyldichloroarsine (Methyldick). Clark I and Clark II were the main agents used.

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Clark I was used with Green Cross munition earlier; however for the first time it was used as a standalone agent in the night from July 10 to July 11 1917 at Nieuwpoort, Belgium, during the operation Strandfest. The artillery munition used as a delivery vehicle contained a large amount of glass spheres closed with a cork and sealed with trinitrotoluene. Later N-ethylcarbazole was added. Depending on the caliber, the munition contained between 7 and 120 kilograms of the agent.

Blue Cross is also a generic World War I German marking for artillery shells with chemical payload affecting the upper respiratory tract. [1]

See also

• Green Cross (chemical warfare)
• Yellow Cross (chemical warfare)
• White Cross (chemical warfare)