6.—(1) No person shall place on the market—
(a)a button cell containing more than 0.0005% of mercury by weight unless it is marked with the chemical symbol “Hg”;
(b)a battery containing more than 0.002% of cadmium by weight unless it is marked with the chemical symbol “Cd”;
(c)a battery containing more than 0.004% of lead by weight unless it is marked with the chemical symbol “Pb”.
(2) Each of the chemical symbols mentioned in paragraph (1) shall—
(a)be printed beneath the crossed out wheeled bin symbol;
(b)cover an area of at least one quarter the size of that symbol; and
(c)be printed visibly, legibly and indelibly.