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Moumoujus

HC BLUE NO. 6.

Avoid CAS 93633-79-5 / HAIR DYEING

HC BLUE NO. 6 is primarily recognized as a direct hair dye, utilized for imparting color to hair. Current research does not indicate any specific mechanism of action or beneficial properties for skin in a skincare context.

Summary

Colorant

Science

Mechanism of Action

This ingredient functions as a direct hair dye, depositing color onto the hair shaft. No specific mechanism demonstrating skincare benefits or therapeutic action on the skin has been identified through available research.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Unknown
Optimal pH N/A
0 7 14

Stability

Specific optimal pH range and stability data for HC BLUE NO. 6 are not available. However, a related hair dye, HC Blue No. 15, has shown stability within a pH range of 3.5-9, with improved color retention in formulations up to pH 9. Decomposition can occur at pH levels exceeding 9.

Conflicts

  • Potentially incompatible with nitrosating agents if the ingredient is a secondary amine, which could lead to the formation of nitrosamines.
  • Based on data for related hair dyes like HC Blue No. 15, it may be incompatible with negatively charged (anionic) surfactants and electrolytes, as these can negatively impact color longevity. Non-ionic or amphoteric detergents are generally recommended in such cases.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Unknown

HC BLUE NO. 6 has not been specifically reviewed by the Cosmetic Ingredient Review (CIR) Expert Panel. While HC Blue No. 2 was deemed safe in hair dye products, showing no evidence of dermal irritation, sensitization, photosensitization, or ocular irritation, it was found to be mutagenic. Concerns exist for other related HC Blue dyes: HC Blue No. 1 was discontinued due to carcinogenicity in animal studies, and HC Blue No. 15 showed mild irritation (erythema, oedema, scaling) in rabbit skin tests, though it was classified as 'not irritating.' HC Blue No. 16, as a secondary amine, carries a risk of nitrosamine formation, with a recommended limit below 50 ppb for related dyes.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

As HC BLUE NO. 6 is primarily a hair dye with no identified skincare benefits and carries potential safety concerns from related compounds, it is not suitable for precision skincare formulations.

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