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Hydroxyethyl-P-Phenylene-Diamine Sulfate

CAS 93841-25-9 ·

KR South Korea (MFDS)

No specific rule on file.

EU European Union (CosIng)

Restricted Annex III/206

Conditions: Product type: (a) Hair dye sub­stance in oxidat­ive hair dye products (b) Products in­tended for col­ouring eyelashes (a) After mixing under ox­idative conditions the maximum concentra­tion applied to hair must not exceed 2,0 % (calculated as sulphate) (b) After mixing under ox­idative conditions the maximum concentra­tion applied to eye­lashes must not exceed 1,75 % (calculated as free base) (b) Professional use

Required label warning: (a) To be printed on the la­bel: The mixing ratio. “Hair colourants can cause severe allergic reac­tions. Read and follow instruc­tions. This product is not in­tended for use on persons under the age of 16. Temporary ‘black henna’ tattoos may increase your risk of allergy. Do not colour your hair if: — you have a rash on your face or sensitive, irri­tated and damaged scalp, — you have ever experi­enced any reaction after colouring your hair, — you have experienced a reaction to a tempor­ary ‘black henna’ tattoo in the past.” (b) As from 3 March 2018, to be printed on the la­bel: The mixing ratio. “This product can cause severe allergic reactions. Read and follow instruc­tions. This product is not in­tended for use on persons under the age of 16. Tem­porary ‘black henna’ tattoos may increase the risk of al­lergy. Eyelashes shall not be co­loured if the consumer: — has a rash on the face or sensitive, irritated and damaged scalp, — has experienced any re­action after colouring hair or eyelashes, — has experienced a reac­tion to a temporary ‘black henna’ tattoo in the past. For professional use only. Rinse eyes immediately if product comes into contact with them”

Source: EU CosIng — Annex III · checked Oct 17, 2026

US United States (FDA)

No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.

Also listed as

HYDROXYETHYL-P-PHENYLENE-DIAMINE SULFATE

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.

Frequently asked questions

Is Hydroxyethyl-P-Phenylene-Diamine Sulfate banned in the European Union?

In the EU's CosIng records it is listed as “Restricted” (EU CosIng — Annex III). A restricted ingredient is allowed within the stated conditions.

Is Hydroxyethyl-P-Phenylene-Diamine Sulfate banned in South Korea?

We found no specific rule for it in Korea's MFDS records. That is not an approval or a safety statement.

Is Hydroxyethyl-P-Phenylene-Diamine Sulfate allowed in cosmetics in the U.S.?

We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.

What is the CAS number of Hydroxyethyl-P-Phenylene-Diamine Sulfate?

CAS 93841-25-9 (from official records).

Ask KBeauty Verified™
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