Cal. Bus. & Prof. Code § 23372
A wine rectifier's license authorizes the person to whom issued to cut, blend, rectify, mix, flavor, or color wine upon which the excise tax imposed by Part 14 of Division 2 of the Revenue and Taxation Code has been paid, and whether so cut, blended, rectified, mixed, flavored, or colored by him, or any other person, to package, label, export, and sell the products to persons holding licenses issued by the department authorizing the sale of wine. The holder of a wine rectifier's license may apply for and hold a wine importer's license, a distilled spirits manufacturer's license, or a distilled spirits manufacturer's agent's license. A wine rectifier's license shall not be issued to or held by the holder of a retail off-sale or retail on-sale license.
Ca. Bus. and Prof'l. Code § 23372