Hair Dye
DIHYDROXYINDOLINE HBR
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A hydrobromide salt of dihydroxyindoline used as an oxidative hair-dye precursor. Standard hair-dye cautions apply.
Dihydroxyindoline HBr (CAS 138937-28-7) is the hydrobromide salt form of a dihydroxyindoline, an oxidative hair-dye intermediate that darkens on coupling with peroxide and couplers. Indoline-class precursors sit in the broader family of hair-coloring substances where SCCS and CIR have individually reviewed several members; this specific grade is not as thoroughly documented in public monographs as classic PPD-family precursors. Like other oxidation dyes, it carries scalp-sensitization risk and reaches the consumer as a reactive chemistry product. Patch testing 48 hours before each application is standard practice.
Function
Skin benefits
- Enables natural-tone hair coloring
Known concerns
- Scalp sensitization risk typical of oxidation dyes
- Thinner public safety record than established precursors
- Patch test required
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related hair dyes
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.