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.
S.C. Code § 39-35-10