In addition to the operations described in section 5352, the proprietor of a taxpaid wine bottling house may, subject to regulations issued by the Secretary, on such premises mix wine of the same kind and taxable grade to facilitate handling; preserve, filter, or clarify wine; and conduct operations not involving wine where such operations will not jeopardize the revenue or conflict with wine operations.
26 U.S. Code § 5363. Taxpaid wine bottling house operations
1979—Pub. L. 96–39 struck out provision that this subchapter apply to any wine received on the bottling premises of any distilled spirits plant for bottling, packaging, or repackaging, and to all operations relative thereto and provision that sections 5021, 5081, and 5082, not apply to the mixing or treatment of taxpaid wine under this section.