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Moumoujus

2-METHYL-1-NAPHTHOL.

Insufficient Data CAS 7469-77-4 / HAIR DYEING

A naphthol derivative primarily known for its role in oxidative hair dyes, with emerging research suggesting potential depigmenting properties through melanosome transport inhibition. This oil-soluble compound demonstrates specialized activity in pigmentation control by interfering with melanocyte-to-keratinocyte transfer mechanisms. Its use in skincare remains largely experimental due to limited safety data for leave-on applications.

Summary

Hair dyeing Potential depigmenting agent Chemical intermediate

Science

Mechanism of Action

Functions as an oxidative coupler in hair dye formulations, reacting with primary intermediates under oxidizing conditions to create permanent color compounds. In pigmentation research, derivatives work by downregulating Rab27a, Melanophilin, and MyosinVa proteins, causing melanosomes to aggregate around the melanocyte nucleus rather than transferring to surrounding keratinocytes.

Research

Clinical Evidence

Low confidence
Effective range 0.001–2%
Optimal

N/A

Key findings

  1. 01 Derivative MNQO at 0.001% reduced pigmentation in reconstructed epidermis models (PubMed 27383204, 2016)
  2. 02 Structural analog 1-Naphthol deemed safe at 2.0% for hair dye applications (SCCNFP/0130/99)

Transparency

Dusting Analysis

Not commonly dusted

Not commonly used in skincare formulations; primarily restricted to hair coloring products with regulatory oversight

The Formula

Formulation

Solubility
Oil
Optimal pH 6.5 – 9.5
0 7 14

Stability

Light-sensitive compound that darkens upon UV exposure due to oxidation; remains stable in air but requires protection from sunlight; highly lipophilic with log Kow ~2.8

Conflicts

  • Strong oxidizing agents
  • Phenolic compounds

Safety

Safety Profile

CIR Status
Insufficient data
Max tested
2%
Sensitization risk Moderate

EU-regulated hair dye ingredient; CIR reports insufficient data for leave-on skin products; ECHA classifies raw material as Category 2 skin irritant and Category 1 eye damage agent

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Insufficient Data

Promising depigmenting research but lacks adequate safety data for skincare applications, remaining primarily suitable for hair dye formulations.

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References

Sources