1 Tex. Admin. Code § 81.154
The county clerk/elections administrator shall prepare ballots in a joint primary so that each party's ballots are easily distinguishable. The county clerk or elections administrator may use different colors of paper in order to achieve this distinction. (Note: Yellow paper may not be used. Only sample ballots may be printed on yellow paper.)
Source Note:The provisions of this §81.154 adopted to be effective November 30, 1999, 24 TexReg 10524.