4-Chlororesorcinol
AKA “p-Chlororesorcinol, 3-Benzenediol, 3-benzenediol, 6-Chlororesorcinol, Resorcinol, 3-dihydroxybenzene”
Synthetic
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Ingredient Facts
4-Chlororesorcinol
AKA: P-Chlororesorcinol, 3-Benzenediol, 3-benzenediol, 6-Chlororesorcinol, 3-dihydroxybenzene
Synthetic · Hair Dyeing · EWG: 6
Plant-Derived
Safety Concern
Synthetic
Clean
A color-depositing ingredient used in hair dyes to help create and stabilize hair color, working to achieve consistent, long-lasting results.
Formula
C6H5ClO2
Mol. Weight
144.55
CAS #
95-88-5
Form
Powder
Plant-Derived
Synthetic. Synthesized from resorcinol, a benzene derivative belonging to the dihydroxybenzene chemical family. Produced through chlorination of resorcinol using chlorinating agents to introduce chlorine at the 4-position.
Function
Hair Dyeing
Benefits
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.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Caution
EWG Score6
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
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR