Korean: 염산2,4-디아미노페놀 · CAS 137-09-7 · Functions: hair dyeing
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : ∙ 산화염모제에 0.02%
∙ 기타 제품에는 사용금지
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 16, 2026
Prohibited Annex II/1338
Conditions: 1-Hydroxy-2,4-diaminobenzene (2,4-Diaminophenol) and its dihydrochloride salts (2,4-Diaminophenol HCl) when used as a substance in hair dye products
Source: EU CosIng — Annex II · checked Oct 16, 2026
No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.
How 2,4-Diaminophenol HCl is treated in 4 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 | Restricted | — |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): when used as a substance in hair dye products^염모제로 사용되는 경우에 한함 |
| BR Brazil | Restricted | MFDS summary (Korean): when used as a substance in hair dye products^염모제로 사용되는 경우에 한함 |
| AR Argentina | Restricted | 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 16, 2026
2,4-Diaminophenol HCl 염산2,4-디아미노페놀
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” (EU CosIng — Annex II).
In Korea's MFDS records it is listed as “Restricted” (MFDS — cosmetic ingredient use restrictions). A restricted ingredient is allowed within the stated conditions.
We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.
The EU's CosIng inventory lists its functions as: hair dyeing.
Korea's MFDS standard Korean name is 염산2,4-디아미노페놀.
CAS 137-09-7 (from official records).