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Moumoujus

HC RED NO. 11.

Insufficient Data CAS 95576-92-4 / HAIR DYEING

HC Red No. 11 is a synthetic organic compound primarily utilized as a colorant in hair dye formulations. This nitro dye is characterized by its low molecular size, enabling it to diffuse into the hair structure to impart temporary or semi-permanent color. Currently, there is no described mechanism of action for direct skin benefits.

Summary

Hair Dyeing

Science

Mechanism of Action

For skin, HC Red No. 11 has no described mechanism of action for providing beneficial effects. Its function is primarily limited to hair coloring, where it adheres to the hair surface or penetrates the hair shaft.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

HC Red No. 11 is primarily a colorant for hair and lacks a described mechanism of action or demonstrated efficacy for skin. Therefore, it is not considered an active ingredient for 'dusting' in precision skincare formulations.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

A mixture containing HC Red No. 10 and No. 11 demonstrated stability for 167 hours in phosphate buffered saline and 286 hours in soap solution. No specific optimal pH range was provided.

Conflicts

  • N-nitrosating agents (nitrosamine content should be limited to <50 ppb if used together)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
2%
Sensitization risk Low

The SCCS concluded that HC Red No. 11, when combined with HC Red No. 10, is safe for consumer health in hair dye formulations at maximum on-head concentrations of 1.0% (oxidative) and 2.0% (non-oxidative). Margins of Safety (MOS) were calculated at 900 (non-oxidative) and 1030 (oxidative), both considered safe (>100). A mixture containing 32.6% HC Red No. 11 was found not to be sensitizing to skin. It is listed in Annex III of the EC Cosmetics Regulation with certain restrictions. FDA status is not explicitly available for this specific chemical, with 'Red Dye #3' referring to a different compound.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Insufficient Data

HC Red No. 11 is primarily a hair dye with no established mechanism of action or demonstrated clinical efficacy for skin, rendering its inclusion in precision skincare formulations for active benefits unsupported.

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