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Moumoujus

ACID VIOLET 9.

Optional CAS 6252-76-2 / HAIR DYEING

Acid Violet 9 is a synthetic xanthene-class dye used exclusively for aesthetic purposes, imparting a violet/purple hue to cosmetic formulations. It does not provide any recognized biological benefit for skin health.

Summary

colorant

Science

Mechanism of Action

Functioning as a colorant, it absorbs visible light to produce its characteristic violet color. The xanthene core may also contribute fluorescent properties to the product.

Research

Clinical Evidence

N/a confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 1.0% aqueous solution was non-irritating to guinea pig skin in a clinical study.
  2. 02 At 0.1%, intracutaneous treatment on guinea pigs showed no sensitizing properties.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4 – 6
0 7 14

Stability

Highly water-soluble, it maintains optimal color stability in slightly acidic to neutral conditions (pH 4-6). Extreme pH levels can cause color shifts or precipitation.

Conflicts

  • Copper ions (darkens color)
  • Iron ions (turns yellow-light/dark)
  • Strongly acidic media (pH < 4)
  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.1%
Sensitization risk Low

Modern EU regulations (Annex II/1335) prohibit its use in hair dyes, and it is currently permitted only in rinse-off products at concentrations up to 0.1% (EU Annex IV/72).

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

Acid Violet 9 is an optional colorant primarily for rinse-off formulations, offering a violet hue within strict concentration limits and regulatory compliance.

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