C. Selection of simulants for testing materials and articles which are already in contact with a known food
5. The simulant or simulants to be used in testing a plastic material or article which is already in contact with a known food shall be—
(a)where the known food is a specific food or is within a specific group of foods described in column 2 of the Table to Part IV of this Schedule and, for the purposes of Part IV of this Schedule, a simulant is, or simulants are, specified in relation to that specific food or specific group of foods, the simulant or simulants so specified;
(b)where the known food is neither a specific food nor within a specific group of foods described in the Table to Part IV of this Schedule, the simulant or simulants in column 2 of Table 2 to this Part of this Schedule opposite the description of food in column 1 of that Table which corresponds most closely to the known food.