1. The signs shall conform in form and colour with those shown in Column 3 of Part I, except that—
(a)in the case of the signs adjoining the classifications “non-flammable compressed gas”, “flammable gas” and “flammable liquid” the symbol and the lettering may be in white;
(b)in the case of the sign adjoining the classification “spontaneously combustible substance” the lettering may be in white;
(c)in place of the word “toxic” wherever it occurs the word “poison” may be
(d)in place of the word “flammable” wherever it occurs the word “inflammable” may be used;
(e)in the case of the sign adjoining the classification “harmful substance”, the word “harmful” may be shown in black lettering under the symbol; and
(f)the sign may show the class number in accordance with the IMDG Code.