[Code of Federal Regulations] [Title 27, Volume 1] [Revised as of April 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 27CFR21.23] [Page 471] TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS CHAPTER I--BUREAU OF ALCOHOL, TOBACCO AND FIREARMS, DEPARTMENT OF THE TREASURY PART 21--FORMULAS FOR DENATURED ALCOHOL AND RUM--Table of Contents Subpart C--Completely Denatured Alcohol Formulas Sec. 21.23 Formula No. 19. To every 100 gallons of ethyl alcohol of not less than 160 proof add: 4.0 gallons of either methyl isobutyl ketone, mixed isomers of nitropropane, or methyl n- butyl ketone; and 1.0 gallon of either kerosene, deodorized kerosene, gasoline, unleaded gasoline, rubber hydrocarbon solvent, or heptane.