27 C.F.R. § 19.349 Mingled spirits or wines held in tanks.
Title 27 - Alcohol, Tobacco Products and Firearms
When spirits of less than 190 degrees of proof or wines are mingled in a tank, the proprietor shall gauge the spirits or wines in the tank and record the mingling gauge on the tank record prescribed in §19.742. (Sec. 201, Pub. L. 85–859, 72 Stat. 1356, as amended (26 U.S.C. 5201))
Title 27: Alcohol, Tobacco and Firearms
PART 19—DISTILLED SPIRITS PLANTS
Subpart L—Storage
Mingling or Blending of Spirits
§ 19.349 Mingled spirits or wines held in tanks.

