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Moumoujus

HC BLUE NO. 11.

Avoid CAS 23920-15-2 / HAIR DYEING

HC Blue No. 11 is a synthetic organic direct dye primarily employed in hair coloring products to impart a blue hue. Its mechanism involves direct deposition onto and penetration of the hair shaft without requiring an oxidizing agent.

Summary

Hair Dyeing

Science

Mechanism of Action

In the context of hair, HC Blue No. 11 functions as a direct dye, absorbing into and adhering to the hair shaft. No specific mechanism of action has been identified to confer benefits for skin.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Commonly dusted

HC Blue No. 11 serves exclusively as a hair colorant and has no identified properties beneficial to the skin. Its inclusion in a skincare formulation would serve no therapeutic purpose and could potentially be a source of irritation, therefore qualifying it as a 'dusted' ingredient.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

A 1 mg/ml solution of HC Blue No. 11 in 0.9% HCl demonstrated stability over 24 hours at room temperature, experiencing only a 3.8% decline in concentration. Specific data regarding its long-term stability in marketed cosmetic products is not available.

Conflicts

  • nitrosating agents

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk High

The Scientific Committee on Consumer Products (SCCP), now SCCS, concluded that HC Blue No. 11 can be safely used in direct hair dye formulations at a maximum on-head concentration of 2.0%. For oxidative hair dyes, the maximum concentration is 1.5% when mixed with hydrogen peroxide. However, these safety assessments are specific to hair products, and no established safe maximum concentration for skincare applications is provided. It must not be used in combination with nitrosating agents, and its nitrosamine content should remain below 50 ppb. Potential for high skin irritancy has been indicated.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

As an ingredient with no demonstrated skincare benefits, a primary function as a hair dye, and a reported high potential for skin irritation, HC Blue No. 11 is not recommended for inclusion in skincare formulations.

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