[Code of Federal Regulations] [Title 27, Volume 1] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 27CFR21.38] [Page 483] TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS CHAPTER I--ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY PART 21_FORMULAS FOR DENATURED ALCOHOL AND RUM--Table of Contents Subpart D_Specially Denatured Spirits Formulas and Authorized Uses Sec. 21.38 Formula No. 4. (a) Formula. To every 100 gallons of alcohol, or to every 100 gallons of rum of not less than 150 proof, add: One gallon of the following solution: Five gallons of an aqueous solution containing 40 percent nicotine; 3.6 avoirdupois ounces of methylene blue, U.S.P.; and water sufficient to make 100 gallons. (b) Authorized uses. (1) As a solvent: 460. Tobacco sprays and flavors. (2) Miscellaneous uses: 812. Product development and pilot plant uses (own use only).