Rule 16.
CFR · 2024-01-01 · US · Title 7
Any lot of tobacco of B, C, or X groups which contains 30 percent or more of pink or pinkish leaves or contains 30 percent or more of a color distinctly different from the major color shall be classified as “mixed” and designated by the color symbol “M.”
official document · source cfr-2024 · id 7:§ 29.3119