7 CFR §29.1007

As applied to flue-cured tobacco, color symbols are L—lemon, F—orange, FR—orange red, R—red, V—greenish, K—variegated, KR—variegated red or scorched, G—green, GR—green red, GK—green variegated (may be scorched), GG—gray green, KL—variegated lemon, KF—variegated orange, KV—variegated greenish, KM—variegated (scorched) mixed, KD—variegated dark red, and LL—whitish-lemon.