1. The sign shall conform in form and colour with that shown in Part II.
2. The 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—
(a)where the sign is shown on a hazard warning panel, be not less than 200 millimetres; or
(b)where the sign is shown on a label, be not less than 95 millimetres.
3. The sign shall, for that part of it which is not black, have a black border, and that border shall—
(a)where the sign is shown on a hazard warning panel, be at least 2 millimetres wide;
(b)where the sign is shown on a label, be at least 1 millimetre wide; or
(c)in either case, be a line which would comply with paragraph 3 of Part II of Schedule 2 to the Classification, Packaging and Labelling of Dangerous Substances Regulations (Northern Ireland) 1985 as read in conjunction with Column 3 of Part I of that Schedule.