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Moumoujus

DISPERSE BLUE 7.

Avoid CAS 3179-90-6 / HAIR DYEING

Disperse Blue 7 is an anthraquinone dye primarily utilized as a colorant, imparting a distinct green-light blue shade. While its cosmetic use is limited to semi-permanent hair coloring systems, its application in precision skincare is highly discouraged due to significant safety concerns.

Summary

Colorant

Science

Mechanism of Action

This compound functions by acting as a colorant, delivering a specific green-light blue hue to formulations. In semi-permanent hair dyes, it can penetrate the hair shaft to some extent. For skin, its mechanism is strictly limited to providing color and offers no active biological benefit.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Disperse Blue 7 is solely a colorant and offers no active benefits for the skin, making the concept of 'dusting' for exaggerated efficacy claims irrelevant.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Disperse Blue 7 is soluble in water (50-100 mg/mL at 21°C) and demonstrates solubility in various organic solvents, including acetone, ethanol, and carbon tetrachloride. As an amine, it is a chemical base that reacts exothermically to neutralize acids, forming salts and water.

Conflicts

  • isocyanates
  • halogenated organics
  • peroxides
  • phenols (acidic)
  • epoxides
  • anhydrides
  • acid halides

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk High

The Cosmetic Ingredient Review (CIR) Expert Panel determined there was insufficient data to assess its safety, specifically requesting additional information on impurities, concentration of use, and clarification of genotoxicity. Studies have indicated genotoxic activity in bacterial assays and L5178Y mouse lymphoma cells. Patch tests have resulted in positive reactions in certain individuals, and anthraquinone dyes are broadly recognized as frequent causes of clothing dermatitis. Importantly, Disperse Blue 7 is explicitly prohibited for use in hair dye products within the European Union (Annex II).

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Given the insufficient safety data, documented genotoxic activity, high potential for irritation and sensitization, and its prohibition in the EU for hair dyes, Disperse Blue 7 is not recommended for use in precision skincare formulations.

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