CFR › Title 21 › Part 333 › §333.32021 CFR §333.320Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Resorcinol identified in § 333.310(b) may be combined with sulfur identified in § 333.310(f).(b)Resorcinol monoacetate identified in § 333.310(c) may be combined with sulfur identified in § 333.310(f).