27 CFR 21.68 – Formula No. 38-F
(a) Formula. To every 100 gallons of alcohol add:
(1) Six pounds of either boric acid, N.F., Polysorbate 80, N.F., or Poloxamer 407, N.F.; 1
(2) A total of at least 3 pounds of any two or more denaturing materials listed under Formula No. 38-B, plus sufficient boric acid, N.F., Polysorbate 80, N.F., or Poloxamer 407, N.F. to total 10 pounds of denaturant; or
(3) Seven pounds of zinc chloride, U.S.P., 2.6 fluid ounces of hydrochloric acid, N.F., and a total of 3 pounds of any two or more of the denaturing materials listed under Formula No. 38-B.
(b) Authorized uses. (1) As a solvent:
(2) Miscellaneous uses: