Korean: 염기성청색9호 · CAS 61-73-4 · Functions: hair dyeing
Prohibited MFDS prohibited ingredients
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 17, 2026
Prohibited only in certain forms or uses Annex II/1306
Conditions: Phenothiazin-5-ium, 3,7-bis(dimethylamino)- and its salts, when used as a substance in hair dye products
Source: EU CosIng — Annex II · checked Oct 17, 2026
Banned in some U.S. states CA-TFCA
Conditions: California: Toxic-Free Cosmetics Act (AB 2762, Ch. 314, Stats. 2020), as amended by AB 496 (Ch. 441, Stats. 2023), AB 60 'Musk Reduction Act' (Ch. 432, Stats. 2025) and SB 39 (Ch. 208, Stats. 2025) · Cal. Health & Safety Code §108980 (subd. (a) 2025 list; (b) 2027 list; (c) musk ketone; (d) trace exemption; (f) boric acid suppositories) · From 2027-01-01 · intentionally added
Source: California — Toxic-Free Cosmetics Act (AB 2762, Ch. 314, Stats. 2020), as amended by AB 496 ( · checked Oct 17, 2026
How Basic Blue 9 is treated in 5 more markets, from the overseas cosmetic regulation database compiled by Korea's MFDS. Always confirm with the regulator of that country before selling there.
| Market | Status | Conditions |
|---|---|---|
| CN China | Prohibited | — |
| AS ASEAN (10 countries) | Prohibited only in certain forms or uses | MFDS summary (Korean): when used as a substance in hair dye products^염모제로 사용되는 경우에 한함 |
| TW Taiwan | Prohibited | — |
| BR Brazil | Prohibited only in certain forms or uses | MFDS summary (Korean): when used as a substance in hair dye products^염모제로 사용되는 경우에 한함 |
| AR Argentina | Prohibited only in certain forms or uses | MFDS summary (Korean): when used as a substance in hair dye products^염모제로 사용되는 경우에 한함 |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 17, 2026
BASIC BLUE 9 염기성청색9호
Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.
In the EU's CosIng records it is listed as “Prohibited only in certain forms or uses” (EU CosIng — Annex II). It is not a general ban — the condition reads: “Phenothiazin-5-ium, 3,7-bis(dimethylamino)- and its salts, when used as a substance in hair dye products”
In Korea's MFDS records it is listed as “Prohibited” (MFDS — cosmetic ingredient use restrictions).
In the FDA's records it is listed as “Banned in some U.S. states” (California — Toxic-Free Cosmetics Act (AB 2762, Ch. 314, Stats. 2020), as amended by AB 496 ().
The EU's CosIng inventory lists its functions as: hair dyeing.
Korea's MFDS standard Korean name is 염기성청색9호.
CAS 61-73-4 (from official records).