S.C. Code Ann. § 39-35-60: Substitutes must be plainly marked.

Every person who lawfully manufactures any substance designed to be used as a substitute for butter or for cheese shall mark by branding, stamping or stenciling upon the top side of each tub, box or other vessel in which such substitute shall be kept or in which it shall be removed from the place where it is produced, in a clear and durable manner, in the English language, the words, "substitute for butter" or "substitute for cheese," as the case may be, in printed letters in plain roman type, each of which shall be not less than one inch in height and one-half inch in breadth.