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Additional Articles relating to the Condition of the Wounded in War. Geneva, 20 October 1868.
Art. 12. The distinctive flag to be used with the national flag, in order to indicate any vessel or boat which may claim the benefits of neutrality, in virtue of the principles of this Convention, is a white flag with a red cross.
The belligerents may exercise in this respect any mode of verification which they may deem necessary.
Military hospital ships shall be distinguished by being painted white outside, with green strake.