27 C.F.R. Subpart F—Optional Gauging Procedures
Title 27 - Alcohol, Tobacco Products and Firearms
The proof of spirits shall be determined to the nearest tenth degree which shall be the proof used in determining the proof gallons and all fractional parts thereof to the nearest tenth proof gallon. The proof of spirits containing solids of 400 milligrams or less per 100 milliliters shall be determined by the use of a hydrometer and a thermometer in accordance with the provisions of §30.23. However, notwithstanding the provisions of §30.31, the proprietor may, at his option, add to the proof so determined the obscuration determined as prescribed in §30.32. (Sec. 201, Pub. L. 85–859, 72 Stat. 1358, as amended, 1362, as amended (26 U.S.C. 5211)) 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
§ 30.71 Optional method for determination of proof for spirits containing solids of 400 milligrams or less per 100 milliliters.
§ 30.72 Recording obscuration by proprietors using the optional method for determination of proof.
