16 Tex. Admin. Code § 45.44
A name indicative of a variety of grape may be employed as the type designation of wine if the wine derives its predominant taste, aroma, and other characteristics, and at least 51% of its volume, from that variety of grape. If such type designation is not known to the consumer as the name of grape variety, there shall appear directly adjacent to such designation an explanatory statement as to the significance thereof.
Source Note:The provisions of this §45.44 adopted to be effective January 1, 1976.