27 CFR § 19.491 - Marks on containers of specially denatured spirits.
(a) General. A proprietor must mark or label each package, case, or encased container of specially denatured spirits filled on bonded premises to show:
(1) The quantity in gallons;
(2) The serial number or lot identification number;
(3) The plant number of the proprietor;
(4) The designation or abbreviation of the specially denatured spirits by kind (alcohol or rum);
(5) The applicable formula number; and
(6) The proof of the spirits, if they were denatured at other than 190 proof.
(b) Bottles. A proprietor must mark or label each bottle to show the information prescribed in paragraphs (a)(1), (3), (4), (5), and (6) of this section.
(c) Alternate formulations. When spirits are denatured under a formula authorizing a choice of types and quantities of denaturants, the proprietor must mark the container or case to show the actual types and quantities of denaturants used.