Tags: Weapon.
Green Cross (Grünkreuz) is a World War I chemical warfare pulmonary agent consisting of chloropicrin (PS Aquinite Klop) phosgene (CG Collongite) and/or trichloromethyl chloroformate (Surpalite Perstoff).Green Cross is also a generic World War I German marking for artillery shells with pulmonary agents (chemical payload affecting the lungs).