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Moumoujus

BASIC BLUE 124.

Valuable CAS 67846-56-4 / HAIR DYEING

A specialized cationic direct dye engineered for high-precision color deposition in hair care. Unlike traditional colorants, it leverages a high degree of hydrophilicity to provide vibrant toning while minimizing unwanted staining on the skin's surface.

Summary

Hair dyeing Colorant

Science

Mechanism of Action

This ingredient operates through electrostatic attraction; its positive charge (cationic) binds tightly to the negatively charged keratin of the hair cuticle. Its large, hydrophilic molecular structure prevents it from penetrating the lipid-rich stratum corneum of the skin, ensuring color remains on the hair fiber rather than the scalp.

Research

Clinical Evidence

High confidence
Effective range 0.01–0.5%
Optimal

0.5%

Key findings

  1. 01 Confirmed safe for semi-permanent applications with an exceptionally high Margin of Safety (4700), indicating very low systemic absorption risk.
  2. 02 Demonstrated superior hair-dyeing performance with significantly reduced skin staining compared to older blue dye alternatives.

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.01%
Red flag below
0.001%

Because Basic Blue 124 is a potent colorant, it is effective at very low concentrations (0.01%). It is rarely 'dusted' because even trace amounts provide visible pigment, though concentrations below 0.01% may fail to provide functional color refreshing.

The Formula

Formulation

Solubility
Both
Optimal pH 5 – 7
0 7 14

Stability

Displays excellent aqueous stability with minimal degradation over time. It maintains color integrity for the duration of standard hair treatment applications.

Synergies

  • Non-ionic surfactants
  • Cationic conditioning agents

Conflicts

  • Nitrosating agents
  • Strongly anionic surfactants
  • Oxidizing agents

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.5%
Sensitization risk High

Classified as a strong skin sensitizer; patch testing is essential. Formulations must strictly avoid nitrosating agents to prevent the formation of regulated nitrosamines.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

An elite, low-stain colorant for targeted hair toning, provided it is formulated within safety limits to manage sensitization risks.

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References

Sources