CFR › Title 7 › Part 29 › §29.11237 CFR §29.1123Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkAny lot of lemon, or orange colored tobacco containing over 20 percent of slick tobacco shall be designated by the symbol “S” in the X, C, or B groups.