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Moumoujus

2-METHOXYMETHYL-P-PHENYLENEDIAMINE SULFATE.

Optional CAS 337906-37-3 / HAIR DYEING

A modified hair dye precursor engineered to reduce allergic reactions compared to traditional p-phenylenediamine. This molecule functions specifically in oxidative hair coloring systems, where it undergoes polymerization to form permanent color within hair shafts. The methoxymethyl modification significantly decreases skin protein binding affinity, making it a safer alternative for individuals with PPD sensitivities.

Summary

hair dyeing color formation

Science

Mechanism of Action

Penetrates hair cuticles as a small colorless molecule, then reacts with hydrogen peroxide and couplers to form large pigment polymers trapped within the hair structure, while the structural modification reduces allergenic skin protein interactions

Research

Clinical Evidence

High confidence
Effective range 1.8–2%
Optimal

1.8%

Key findings

  1. 01 SCCS safety evaluation confirmed non-irritating properties in human skin models for eyelash and eyebrow applications
  2. 02 Demonstrated 70% reduction in skin sensitization rates compared to standard PPD in allergic individuals

Transparency

Dusting Analysis

Not commonly dusted

Specialized hair dye ingredient with restricted regulatory applications, not subject to typical cosmetic dusting practices

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 10
0 7 14

Stability

Requires oxygen-free environment or antioxidant stabilizers like sodium sulfite; stable in solid sulfate form but degrades in aqueous solutions without proper stabilization

Synergies

  • Hydrogen peroxide (oxidizing agent)
  • Hair dye couplers
  • Sodium sulfite (stabilizer)

Conflicts

  • Strong oxidizing agents
  • Strong acids

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
1.8%
Sensitization risk Low

Restricted to oxidative hair and eyelash/eyebrow dyes only; prohibited in direct dermal coloring applications like temporary tattoos

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

Specialized hair coloring ingredient with improved safety profile, but limited to specific oxidative dye applications rather than general skincare.

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