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Moumoujus

6-NITRO-2,5-PYRIDINEDIAMINE.

Questionable CAS 69825-83-8 / HAIR DYEING

A synthetic nitro dye compound that functions as a direct colorant, primarily used in hair coloring applications. This water-soluble ingredient delivers yellow-orange to blue-violet pigmentation through physical deposition without requiring oxidative activation.

Summary

Colorant Hair dyeing agent

Science

Mechanism of Action

Functions as a direct nitro dye that deposits color through physical adherence to hair shafts and skin surfaces, bypassing the need for oxidative developers while maintaining stability across alkaline pH ranges

Research

Clinical Evidence

Medium confidence
Effective range 0.1–1%
Optimal

1%

Key findings

  1. 01 Clinical patch testing at 2.5% concentration demonstrated non-irritating properties in human subjects
  2. 02 Historical safety assessment confirmed efficacy as direct colorant in 0.1-1.0% concentration range

Transparency

Dusting Analysis

Not commonly dusted

Limited to specialized hair coloring applications with established concentration limits

The Formula

Formulation

Solubility
Water
Optimal pH 6.5 – 9.5
0 7 14

Stability

Red/orange powder form maintains stability for minimum 2 months at ambient temperature in alkaline conditions

Conflicts

  • Strong oxidizing agents
  • Strong acids
  • Formaldehyde donors

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
1%
Sensitization risk Moderate

EU prohibited (Annex II) due to insufficient recent industry data rather than proven toxicity; potential cross-sensitization with p-phenylenediamine allergens

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Specialized colorant with regulatory restrictions and sensitization concerns limits broader skincare applications.

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