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Moumoujus

6-METHOXY-2-METHYLAMINO-3-AMINOPYRIDINE HCL.

Questionable CAS 90817-34-8 / 83732-72-3 (2HCl) / HAIR DYEING

A specialized coupler compound primarily utilized in oxidative hair coloring systems to create permanent color deposits within hair fibers. This synthetic aromatic amine functions as a precursor that reacts with oxidizing agents and primary intermediates to form complex chromophores that permanently alter hair pigmentation.

Summary

Hair dyeing Color coupling Chromophore formation

Science

Mechanism of Action

Functions as a reactive coupler in oxidative hair dyeing processes, combining with primary intermediates like p-phenylenediamine in the presence of hydrogen peroxide to generate stable chromophore complexes that penetrate and deposit within the hair shaft structure.

Research

Clinical Evidence

Medium confidence
Effective range 1–1%
Optimal

1%

Key findings

  1. 01 EU SCCS safety evaluation at 1.0% concentration showing 2.93% skin penetration rate
  2. 02 Human patch testing at 10.0% concentration resulted in mild reactions in 20% of subjects

Transparency

Dusting Analysis

Not commonly dusted
Red flag below
5.6%

Not applicable for dusting as this ingredient is exclusively used in hair coloring formulations with strict regulatory concentration limits of 1.0% maximum.

The Formula

Formulation

Solubility
Water
Optimal pH 9 – 10
0 7 14

Stability

Maintains stability in aqueous solutions for approximately 2 hours with less than 10% variation. Requires alkaline pH environment for optimal hair cuticle swelling and color penetration.

Synergies

  • Primary hair dye intermediates
  • Hydrogen peroxide oxidizing systems

Conflicts

  • Nitrosating agents
  • Strong oxidizing agents outside controlled dye reactions

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Moderate

EU regulated with maximum 1.0% concentration limit. Classified as skin sensitizer with EC3 value of 5.6%. Secondary amine structure requires nitrosamine content below 50 ppb to prevent nitrosation concerns.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Specialized hair dye ingredient with moderate sensitization risk and strict regulatory limitations, unsuitable for general skincare applications.

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