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Moumoujus

4-NITROGUAIACOL.

Avoid CAS 3251-56-7 / HAIR DYEING

A nitrophenolic compound historically utilized in hair dye formulations but now banned in cosmetic applications due to significant safety concerns. This aromatic compound can stimulate cellular metabolic activity but poses substantial irritation risks to skin and eyes.

Summary

Hair dyeing agent

Science

Mechanism of Action

Functions as a cellular activator that enhances protoplasmic flow and increases metabolic activity within cells, though its aromatic nitro structure also enables color deposition through oxidative pathways.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted
Red flag below
0%

This ingredient is prohibited in cosmetic formulations, making any presence a regulatory violation rather than dusting concern.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits photosensitivity requiring storage in cool, dark conditions. Shows pH-dependent degradation with accelerated photolysis under acidic conditions. Classified as combustible solid.

Conflicts

  • Strong oxidizing agents
  • Strong bases
  • Acid chlorides
  • Acid anhydrides

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0%
Pregnancy
Caution
Sensitization risk High

Explicitly prohibited in EU cosmetic products under Annex II/1251 and Indian standards IS 4707. Classified with hazard codes H315 and H319 for skin and serious eye irritation.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

A prohibited cosmetic ingredient with documented safety hazards and no approved skincare applications.

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References

Sources