4-Chlororesorcinol
INCI: 4-CHLORORESORCINOL
CAS 95-88-5 EC 202-462-0
1,3-Benzenediol, 4-chloro-
Limited Data
Insufficient safety data available. Consider enriching this ingredient.
Details
Description
1,3-Benzenediol, 4-chloro-
Purpose
Function
Oxidative hair dyeing (coupler — reacts with primary intermediates to form final dye)
Profile
Properties
Silicone
Silicone free
Compliance
Regulatory Status
EU
Banned
Safety
POOR
US
Permitted
EU Max Concentration2.5%
Absorptionlow
Sensitizationmoderate
MoSadequate
NOAEL70 mg/kg
ConcernHigh
Flags
potential-allergeneu_cosing_listed
Verdict
Moderate sensitizer — mandatory patch test warning. No evidence of carcinogenicity or reproductive/developmental toxicity at 2% dermal. Must not exceed 2.5% after mixing.
US Note
CIR concluded safe as used in hair dye formulations (original 1996, reaffirmed 2011). Use concentration 0.005–2%
Assessment
Ratings
Reference