Any lot of tobacco of the B, C, or X groups shall be classified as ``mixed'' and designated by the color symbol ``M'' when it is not green but contains (a) over 30 percent of colors distinctly different from the major color or (b) over 30 percent of a combination of variegated and colors distinctly different from the major color mingled together. [51 FR 40408, Nov. 7, 1986]