Article 6.--In the event of any of the high contracting parties denouncing the present Convention, the denunciation shall only take effect after notification has been made in writing to the Government of the Netherlands and communicated by that Government at once to all the other contracting Powers. Such denunciation shall be effective only in respect of the Power which shall have given notice of it. [Sidenote: Sick-Bays.] § 206_b_. According to article 7, in case of a fight on board a man-of-war, the sick-bays must, as far as possible, be respected and spared. These sick-bays, and the material belonging to them, remain subject to the laws of war; they may not, however, be used for any purpose other than that for which they were originally intended so long as they are required for the wounded and sick. But should the military situation require it, a commander into whose power they have fallen may nevertheless apply them to other purposes, under the condition that he previously makes arrangements for proper accommodation for the wounded and sick on board. The protection to which sick-bays are entitled ceases if they are made use of to commit acts harmful to the enemy (article 8). But the fact that the staff of sick-bays is armed in order to defend the wounded and sick is not sufficient reason for withdrawing protection. [Sidenote: Distinctive Colour and Emblem of Hospital Ships.] § 207. All military hospital ships must be painted white outside with a horizontal band of green about one metre and a half in breadth. Other hospital ships must also be painted white outside, but with a horizontal band of red. The boats and small craft of hospital ships used for hospital work must likewise be painted white. And besides being painted in this distinguishing colour, all military and other hospital ships (article 5) must hoist, together with their national flag, the white flag with a red cross stipulated by the Geneva Convention. If they belong to a neutral State, they must also fly at the main mast the national flag of the belligerent under whose control they are placed. Hospital ships which, under the terms of article 4, are detained by the enemy, must haul down the national flag of the belligerent to whom they belong. All hospital ships which wish to ensure by night the freedom from interference to which they are entitled, must, subject to the assent of the belligerent they are accompanying, take the necessary measures to render their special painting sufficiently plain. According to article 6 the distinguishing signs mentioned in article 5 may only be used, whether in time of peace or war, for protecting or indicating the ships therein mentioned.