Paragraph 5
No material shall contain any added binder, anti-caking agent or coagulant other than one named or described in Part IV, or any substance named or described in Chapter B of that Part unless—
(a)
taking account of any such substance which is naturally present, the maximum content (if any) specified in relation thereto in column 4 of that Chapter is not exceeded, and
(b)
the material is to be used in accordance with the conditions (if any) laid down in respect of it in column 5 of that Chapter.