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  • industrial

4-Aminophenol hydrochloride

CAS 51-78-5

4-Aminophenol hydrochloride chemical structure

Concern score

Not assessed — no hazard data yet.

4-Aminophenol hydrochloride in plain language

What it is

On cosmetic ingredient lists it appears as “P-aminophenol hcl”.

Also known as P-aminophenol hcl · P-aminophenol hydrochloride · 4-Aminophenol--hydrogen chloride (1/1) · 4-aminophenol;hydrochloride · P-hydroxyaniline hydrochloride · 4-HYDROXYANILINIUM chloride

Show all 25 names

4-Hydroxyanilinium chloride (CI 76550) · C.I. 76551 · C.I. Oxidation Base 6A · CI 76551 · CI Oxidation Base 6A · Durafur Brown R · Fouramine CP · Fourrine 83 · Fourrine P · Furro P · Futramine P · Phenol, 4-AMINO-, hydrochloride · Pelagol CP · Pelagol Grey CP · Peltol P · Phenol, 4-amino-, hydrochloride (1:1) · Phenol, p-amino-, hydrochloride · Rodol pc · p-aminophenol hydrochloride(cas # 51-78-5)

What it does

Used in cosmetics as a hair dye.

  • Hair dyeing
  • Colourant
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. 4-Aminophenol hydrochloride appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 1 composition records across product categories including Specialty occupational products. EPA CPDat classifies this chemical for functional uses including Dye.
    • EPA CPDat observed this chemical in 1 composition records across product categories including Specialty occupational products. EPA CPDat classifies this chemical for functional uses including Dye.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for 4-Aminophenol hydrochloride. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for 4-Aminophenol hydrochloride yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated 2019-12-20

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

How often EPA CPDat has listed 4-Aminophenol hydrochloride in a product composition. These are source records, not Greenveil catalog products.

Source records

1

Named organisations

1

Specialty occupational products

Typical roles

Hair dyeingColourant
See products using 4-Aminophenol hydrochloride →