4. Solid mineral hydrocarbon used or intended for use in any chewing compound—
(a)shall comply with the requirements contained in sub-paragraphs (a), (b), (c) and (d) of paragraph 3 of this Part of this Schedule; and
(b)shall have been tested, before being used in the composition of any chewing compound, for the presence of polycyclic hydrocarbon by the method described in Part II of this Schedule with the result described in paragraph 6 of the said Part II, and if such solid mineral hydrocarbon is tested subsequently by the said method, shall give the said result.