S.C. Code Ann. § 39-35-10: "Imitation butter" and "imitation cheese" defined.

For the purpose of this article, substance or compound, not produced wholly from pure milk, designed to be used as a substitute for butter or cheese made from pure milk or cream from pure milk is hereby declared to be imitation butter or imitation cheese, as the case may be; provided, that the use of salt, rennet and harmless coloring matter for coloring the product of pure milk or cream shall not be construed to render such product an imitation.