Get a Free 5ml Mini Now Free 5ml Mini With Every Order of The Mantle
Moumoujus

DISPERSE BLACK 9.

Valuable CAS 20721-50-0 / HAIR DYEING

Disperse Black 9 is a synthetic monoazo colorant extensively utilized for imparting a black hue in cosmetic applications. Primarily recognized in hair care, its function on the skin relies on direct pigment deposition to achieve coloration.

Summary

Cosmetic Colorant Pigment

Science

Mechanism of Action

As a monoazo colorant, Disperse Black 9 operates by physically depositing pigment particles onto the skin's surface, resulting in a black coloration. This mechanism differs from dyes that chemically alter the substrate.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Disperse Black 9 is a specific colorant, not typically used as a 'dusted' active ingredient with a threshold for minimal efficacy.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The compound exhibits susceptibility to hydrolysis across a pH range of 4-9, suggesting potential degradation within these conditions. Nevertheless, stability tests in a 0.5% methylcellulose solution at 2-8 °C demonstrated robust stability with a coefficient of variation below 3% over a 15-day period.

Conflicts

  • Oxidizing agents (e.g., nitrates, oxidizing acids, chlorine bleaches, pool chlorine) due to a potential risk of ignition.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
0.3%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded Disperse Black 9 is safe for use as a hair dye ingredient, reaffirming this in 2006. The Scientific Committee on Consumer Safety (SCCS) similarly found it safe for non-oxidative hair dye formulations at an on-head concentration of 0.3% (corresponding to 0.15% active dye). A human clinical study utilizing a 3% suspension demonstrated no irritation or sensitization in subjects. While it contains 4-aminobiphenyl (4-ABP), a human carcinogen, its concentration of 4.35 ppm was deemed tolerable by SCCS. Material Safety Data Sheets (MSDS) have indicated potential for sensitization via skin contact and mild irritation in some individuals or rabbit skin. Direct FDA approval for general skin applications beyond its role as a cosmetic colorant is not explicitly documented.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Disperse Black 9 is a valuable and generally well-tolerated colorant for achieving black pigmentation in cosmetic formulations, supported by regulatory safety assessments for specific applications.

Related

Similar Ingredients

Finding similar ingredients…