Database/Hair Dyeing/Pigment Red 5
100% petroleum · ISO 16128

Is Pigment Red 5 natural?

No. The azo-coupled naphthol anilide framework is built from petrochemical benzene and naphthalene derivatives, and the chlorine is carbon-bonded, so nothing is natural origin.

INCI namePigment Red 5
CAS6410-41-9
FormulaC30H31ClN4O7S · 627.1 Da
FunctionHair Dyeing
FeedstockDominant route is diazotisation of a substituted aniline…

How we scored it

C30H31ClN4O7S 627.1 Da: naphthol AS, substituted anilines and sulfonamide are all benzene/naphthalene chemistry; C-bonded Cl is petrochemical framework. 0 / 627.1 = 0.00.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Dominant route is diazotisation of a substituted aniline and coupling with a naphthol AS component, both derived from coal-tar or petroleum aromatics. No natural-origin route exists.

In plain English

A synthetic red azo pigment (a naphthol AS type) that gives a bright red colour and is listed here as a hair-colouring ingredient. It is built from petrochemical aromatic compounds such as naphthol and substituted anilines.

CosIng definition: Pigment Red 5 is classed chemically as a monoazo colour. It conforms to the formula:

Natural alternatives with the same function

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The active self-tanning ingredient that reacts with skin's surface proteins to produce a temporary bronze colour; made by…

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 Lawsonia Inermis Extract 100% natural origin

A plant extract from the henna shrub, used to condition hair and skin and add a reddish tint.…

 Pyrogallol 100% natural origin

A hair-dye ingredient traditionally made by heating gallic acid, itself extracted from plant tannins in gallnuts, until it…

Structure

2D structure of Pigment Red 5

N-(5-chloro-2,4-dimethoxyphenyl)-4-[[5-(diethylsulfamoyl)-2-methoxyphenyl]diazenyl]-3-hydroxynaphthalene-2-carboxamide

PubChem CID 82169 ↗

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2Pigment Red 5. PubChem CID 82169. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PIGMENT RED 5. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PIGMENT RED 5. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PIGMENT%20RED%205