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Moumoujus

4-FORMYL-1-METHYLQUINOLINIUM-P-TOLUENESULFONATE.

Questionable CAS 223398-02-5 / HAIR DYEING

A quinolinium-based chemical intermediate primarily designed for oxidative hair coloring systems. This synthetic compound functions as a dye precursor that requires oxidative activation to form colored pigment molecules within hair keratin structures.

Summary

hair dyeing color formation oxidative coupling agent

Science

Mechanism of Action

Functions as a coupling agent in oxidative hair dye formulations, reacting with hydrogen peroxide and other intermediates to create large, stable pigment molecules that become permanently trapped within hair fiber structures

Research

Clinical Evidence

High confidence
Effective range 0.5–2.5%
Optimal

2.5%

Transparency

Dusting Analysis

Not commonly dusted
Red flag below
2.5%

Regulatory maximum established at 2.5% for hair applications; not intended for general skincare formulations

The Formula

Formulation

Solubility
Water
Optimal pH 4.8 – 9.5
0 7 14

Stability

Demonstrates excellent stability in aqueous systems and DMSO for 48+ hours with >96% recovery; requires oxidative environment for activation

Synergies

  • Hydrogen peroxide
  • Other oxidative hair dye intermediates

Conflicts

  • Reducing agents
  • Strong alkaline conditions above pH 9.5
  • Non-oxidative formulation environments

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
2.5%
Sensitization risk Low

EU regulated under Annex III/274; confirmed eye irritant with moderate skin irritation potential; non-sensitizing in LLNA testing but requires allergy warnings for hair dye applications

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Specialized hair dye intermediate with no established skincare benefits and moderate irritation potential.

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