The commissioner, with the approval of the Board of Agriculture and Industries, may determine or design brands or labels for identifying farm products or fish packed and processed in accordance with the official grades and standards established as provided by law and may furnish information to packers and shippers as to where such labels may be obtained. A written application to the said commissioner requesting permission to use said brands or labels and a written acceptance thereto by the said commissioner or his duly authorized assistants shall be a condition precedent to the use of such brands or labels. The said commissioner, with the approval of said board, may revoke or suspend the right to use such brands or labels whenever it appears on investigation that they have been used to identify farm products or fish not in fact conforming to the grade indicated.