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Moumoujus

HC BROWN NO. 4.

Avoid / COLORANT

HC BROWN NO. 4 is a synthetic direct dye designed to impart color to hair fibers. Its mechanism involves adhering to the hair surface and, for semi-permanent applications, diffusing into the hair due to its low molecular weight. This ingredient is primarily a hair colorant and does not possess known mechanisms of action for specific skincare benefits.

Summary

Hair Colorant

Science

Mechanism of Action

As a direct dye, HC BROWN NO. 4 operates by adhering to the surface of hair strands, providing temporary coloration. For more lasting semi-permanent effects, its molecular size allows for diffusion into the hair shaft. There is no documented mechanism by which HC BROWN NO. 4 provides beneficial action on skin cells.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

This ingredient is a synthetic dye with no documented skincare benefits or typical application as a 'dusted' component in precision skincare formulations.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

If HC BROWN NO. 4 is a secondary amine, it may be susceptible to nitrosation. Therefore, the nitrosamine content must be maintained below 50 ppb, and it should not be formulated in conjunction with nitrosating substances to ensure product stability and safety.

Conflicts

  • Nitrosating substances

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

While the SCCS in the EU has broadly assessed numerous hair colorants as safe for use, HC BROWN NO. 4 specifically lacks a CIR review for its safety profile. In the United States, ingredients like HC BROWN NO. 4, often classified under 'coal tar hair dyes,' are regulated by the FDA. Products containing such dyes mandate specific caution statements and instructions for preliminary patch tests on product labels due to the potential for skin irritation in certain individuals. A patch test is highly recommended prior to use.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

HC BROWN NO. 4 is a synthetic hair dye with no identified skincare benefits and a noted potential for skin irritation, rendering it unsuitable for precision skincare formulations.

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