27 C.F.R. § 30.72 Recording obscuration by proprietors using the optional method for determination of proof.
Title 27 - Alcohol, Tobacco Products and Firearms
Any proprietor using the optional method for determination of proof for spirits containing solids of 400 milligrams or less per 100 milligrams as provided in §30.71 shall record the obscuration so determined on the record of gauge required by 27 CFR part 19. (Sec. 201, Pub. L. 85–859, 72 Stat. 1358, as amended, 1362, as amended (26 U.S.C. 5211))
Title 27: Alcohol, Tobacco and Firearms
PART 30—GAUGING MANUAL
Subpart F—Optional Gauging Procedures
§ 30.72 Recording obscuration by proprietors using the optional method for determination of proof.
