Database/Hair Dyeing/Phenyl Methyl Pyrazolone
100% petroleum · ISO 16128

Is Phenyl Methyl Pyrazolone natural?

No. Synthesised from petrochemical phenylhydrazine and acetoacetate ester; no natural route exists.

INCI namePhenyl Methyl Pyrazolone
CAS89-25-8
FormulaC10H10N2O · 174.20 Da
FunctionHair Dyeing
FeedstockManufactured from petroleum-derived phenylhydrazine condensed with ethyl acetoacetate.…

How we scored it

Pyrazolone made from petrochemical phenylhydrazine + ethyl acetoacetate -> 0.0.
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

Manufactured from petroleum-derived phenylhydrazine condensed with ethyl acetoacetate. Used as a hair-dye coupler with no natural alternative.

In plain English

A synthetic dye-coupling ingredient made from petroleum feedstocks, used in permanent hair colour to help form the final dye shade.

Natural alternatives with the same function

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 Dihydroxyacetone 100% natural origin

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 Epicatechin 100% natural origin

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 Lawsonia Inermis Extract 100% natural origin

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 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 Phenyl Methyl Pyrazolone

5-methyl-2-phenyl-4H-pyrazol-3-one

PubChem CID 4021 ↗

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. 2Phenyl Methyl Pyrazolone. PubChem CID 4021. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3PHENYL METHYL PYRAZOLONE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4PHENYL METHYL PYRAZOLONE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PHENYL%20METHYL%20PYRAZOLONE