A person who shears sheep shall, before or during the act of shearing, separate from the flECe all wool on which a prohibited substance is present. "Prohibited substance" means a substance which: (a) is, or contains, tar, pitch or paint incapable of being removed by scouring, or (b) is, or contains, a substance to which this ion applies, or (c) is, daggings. Section 5 prohibits dealings in wool on which prohibited substance is present. The Minister may by order prohibit the use of any specified