SCHEDULE 1 THE CLASSIFICATION OF AND HAZARD WARNING SIGNS FOR EXPLOSIVES

PART II SPECIFICATION OF HAZARD WARNING SIGNS
2 Each hazard warning sign shall be in the form of a square set with its sides at an angle of 45° to the vertical and the length of the sides shall be not less than 100 millimetres, except that, in the case of receptacles that are of such dimensions that they can only bear smaller signs, the sign should be as large as is reasonably practicable.