4-Chlororesorcinol
molecular structure · PubChem
AKA: 95-88-5, 4-chlorobenzene-1, 3-diol, P-Chlororesorcinol, 1, 3-Benzenediol, 4-Chloro-1, 3-benzenediol, 6-Chlororesorcinol, 3-dihydroxybenzene
Synthetic
Safety Concern
Not Clean
1,3-Benzenediol, 4-chloro-
Formula
C6H5ClO2
Mol. Weight
144.55
CAS #
95-88-5
Form
Powder
State
Beige-brown solid; [EC: SCCS - Opinion] Light beige granular powder with a mild phenolic odor; [Jos. H. Lowenstein and Sons MSDS]
Functions
Hair Dyeing
Colors Hair
Traditional Use
A synthetic derivative of resorcinol with halogenation for enhanced chemical stability. Developed in the 20th century for use as a hair dye coupler in permanent color systems.
EWG
6
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
ewg-6
medical-approval
all-shades-safe
Phototoxicity Concern
Concentration Guide
5%
0%7%
Reg. Limit
EU regulatory limit: 5%. 0,. (a) To be printed on the label: The mixing ratio. “ Hair colorants can cause severe allergic reactions. Read and follow instructions. This product is not intended for use on persons under the age of 1... Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 22.
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR