Measures in relation to stained specified risk material
13. Where specified risk material has been stained in accordance with regulations 9 or 10 or 25(5)(b), the occupier of any premises at which such material is stored or handled and, in the case of premises approved under regulations 22 to 24, the operator of those premises, shall take appropriate measures to ensure that colouring remains visible—
(a)in the case of stained specified risk material, other than the head of a sheep or goat, over the whole surface of the material; and
(b)in the case of the head of a sheep or goat, over the whole of the cut surface and the majority of the head,
until the stained specified risk material is incinerated or rendered.