Shell eggs, which fail to meet or are not above minimum requirements provided for by this act, shall be sold simply as eggs, except if the shells have been treated with oil or in any other manner, then the package or container shall be clearly and conspicuously marked in a legible manner "shell treated" or "shell protected" if sold as fresh eggs, even if conforming to the requirements provided for in this act.
31 P.S. § 322d