[Code of Federal Regulations] [Title 27, Volume 1] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 27CFR21.93] [Page 548] 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 E_Specifications for Denaturants Sec. 21.93 Acetaldehyde. (a) Aldehyde content (as acetaldehyde). Not less than 95.0 percent by weight. (b) Color. Colorless. (c) Odor. Characteristic pungent, fruity odor. (d) Specific gravity at 15.56 [deg]/15.56 [deg]C. Not less than 0.7800.