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4-AMINO-2-NITRODIPHENYLAMINE-2'-CARBOXYLIC ACID.

Questionable CAS 117907-43-4 / HAIR DYEING

A specialized synthetic compound primarily developed for hair coloring applications that provides reddish-orange pigmentation through its reactive nitro and amino functional groups. While technically safe at concentrations up to 2.0% according to SCCS evaluation, this ingredient offers no meaningful skincare benefits and functions solely as a colorant. Its primary relevance to skincare lies in cosmetic formulations where color modification is desired rather than therapeutic skin improvement.

colorant hair dyeing agent

Science

Functions exclusively as a colorant through direct dye penetration or oxidative color development reactions, with no established biological activity or skin benefit mechanisms in skincare applications


Research

Medium confidence
Effective range ≤2%
Optimal

N/A

Key findings

  1. 01 SCCS safety evaluation confirmed no consumer health risk at maximum concentration, excluding sensitization potential

Transparency

Not commonly dusted

This ingredient is not commonly used in skincare formulations and lacks established therapeutic benefits that would warrant dusting practices


The Formula

Solubility
Water
Optimal pH 3 – 10
0 7 14

Stability

Maintains stability in aqueous solutions for 24+ hours at room temperature and tolerates oxidative conditions for extended periods, though thermal decomposition occurs above 202°C

Conflicts

  • Strong oxidizing agents outside intended dye reactions
  • Strong reducing agents

Safety

CIR Status
Not reviewed
Max tested
2%
Sensitization risk Moderate

Classified as hair dye substance with established safety profile for intended applications but noted sensitization potential requires consideration


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Questionable

A hair dye ingredient with no established skincare benefits and sensitization concerns that makes it unsuitable for precision skincare formulations.


Related

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References