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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Annex I : Draft agreement relating to hospital and safety zones and localities - Art. 6.
Hospital and safety zones shall be marked by means of oblique red bands on a white ground, placed on the buildings and outer precincts.
Zones reserved exclusively for the wounded and sick may be marked by means of the Red Cross (Red Crescent, Red Lion and Sun) emblem on a white ground.
They may be similarly marked at night by means of appropriate illumination.
Commentary of 1958