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Hc yellow no. 5

CAS 56932-44-6 · 100/100 · High conf.

Hc yellow no. 5 chemical structure

Concern score

100/100Critical concern based on regulatory listings.
High confidence

Hc yellow no. 5 in plain language

What it is

Also known as HC Yellow 5 · N'-(2-hydroxyethyl)-4-nitro-o-phenylenediamine (HC Yellow 5) · 2-(2-Amino-4-nitroanilino)ethan-1-ol · 2-(2-amino-4-nitroanilino)ethanol · N1-(2-HYDROXYETHYL)-4-NITRO-O-PHENYLENEDIAMINE · 1-N-hydroxyethyl-2-amino-4-nitroaniline

Show all 15 names

2-((2-AMINO-4-NITROPHENYL)AMINO)ETHANOL · 2-(2-amino-4-nitro-anilino)ethanol · 2-Amino-4-nitro-N-(2-hydroxyethyl)aniline · Colorex HCY5 · Covariane jaune w 1125 lp · Ethanol, 2-(2-AMINO-4-NITROANILINO)- · N'-(2'hydroxyethyl)-4-nitro-O-phenylenediamine · N'-(2-Hydroxyethyl)-4-nitro-ortho-phenylenediamine · UNII-I844A312T7

What it does

Used in cosmetics as a hair dye.

  • Hair dyeing
  • Colourant
Is it a concern?
Critical concern: no hazard classifications on record. It is banned in EU cosmetics.

Why it's flagged

N1-(2-Hydroxyethyl)-4-nitro-o-phenylenediamine (HC Yellow No 5) and its salts, when used as a substance in hair dye products is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — banned

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.

    banned
    View source →
  • EUCosIngActive2 entries
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Dye.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified 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 Hc yellow no. 5. 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 Hc yellow no. 5 yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →
  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2010-10-21

    Open →
  • EPA Chemical and Products Database

    exposure · updated 2020-02-13

    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

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often EPA CPDat has listed Hc yellow no. 5 in a product composition. These are source records, not Greenveil catalog products.

Named organisations

2

Typical roles

Hair dyeingColourant
See products using Hc yellow no. 5 →