Every person that sells, consigns, ships, or presents to any other person any butter that has been shipped or imported into this state from any place outside of the United States shall, before he does so, do all of the following:
(a)
Cause to be stamped, marked, or printed upon the wrapper, or other container in blackface letters which are not less than one-eighth of an inch in height the word “imported.”
(b)
Display in a conspicuous place in his public salesroom a sign, which shall be not less than one foot in height and two feet in length, which bears the words “imported butter sold here” in blackface letters not less than three inches in height and one-half inch in width upon a white ground.