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    1.    The subsidiary hazard signs to be used shall be those shown in column 2 of Part I of this Schedule for the subsidiary hazard of the goods shown in the corresponding entry in column 1 of that Part and the signs shall conform in form and colour to those shown in the said column 2, except that in the case of the signs for the subsidiary hazards "Danger of fire (flammable gas)", "Danger of fire (flammable liquid)", or "Danger of emission of flammable gas on contact with water" the symbol may be in white.

    2.    The words in column 3 of Part I of this Schedule may be included in the lower half of the relevant sign shown in the corresponding entry in column 2 of that Part and where included shall conform in form and colour to those shown in the said column 3, except that—


(a)  in the case of the signs for the subsidiary hazards "danger of fire (flammable gas)", "danger of fire (flammable liquid)", "liable to spontaneous combustion" and "danger of emission of flammable gas on contact with water", any lettering may be in white;


(b)  in the case of the sign for the classification "corrosive substance" the lettering shall be in white;


(c)  in place of the word "toxic", the word "poison" may be used; and


(d)  in place of the word "flammable", the word "inflammable" may be used wherever it occurs.

    3.    Each subsidiary hazard sign shall be in the form of a square set with its sides at an angle of 45° to the vertical.

    4.    Subsidiary hazard signs shall have a line of the same colour as the symbol, 5 millimetres inside the edge and running parallel to it. (The broken line which surrounds each sign as depicted in column 2 of Part I of this Schedule delineates the edge of that sign and need not be shown.)