Descriptive matter upon the label shall be free from any statement, design, or device that is in itself misleading or that conveys or tends to convey information that the product is derived from other than the ingredients of which it is composed; and it shall be unlawful to label oleomargarine "dairy rolls," "country rolls," "Guernsey," "Jersey," "Holstein," or other labeling that would indicate that the product is of dairy or creamery origin. The use of any false or misleading statement, design, or device shall not be justified by any statement given as the opinion of any expert or other person appearing on the label, nor by any descriptive matter explaining the use of the false or misleading statement, design, or device.