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Moumoujus

HC YELLOW NO. 11.

Questionable CAS 73388-54-2 / HAIR DYEING

HC Yellow No. 11 is a direct hair colorant used to impart a yellow hue. While its skin penetration has been evaluated in hair dye applications, it offers no known benefits for skin health or function. As a secondary alkanolamine, its formulation requires careful consideration due to its propensity for nitrosation.

Summary

Colorant

Science

Mechanism of Action

This ingredient primarily functions as a direct colorant, depositing yellow pigment onto hair fibers. No specific mechanism of action or beneficial activity on the skin itself has been identified or detailed in available research, beyond its role in coloration during incidental skin contact in hair dye applications.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Skin penetration was evaluated on human dermatomed skin samples at a concentration of 0.954% when applied within a hair dye formulation for 30 minutes. The maximum concentration proposed for incorporation in semi-permanent hair dye formulations is 1.1%.

Transparency

Dusting Analysis

Not commonly dusted

HC Yellow No. 11 is utilized as a hair colorant and does not possess direct skin benefits. Therefore, the concept of 'dusting' related to insufficient active concentration in skincare formulations does not apply to this ingredient.

The Formula

Formulation

Solubility
Unknown
Optimal pH N/A
0 7 14

Stability

As a secondary alkanolamine, HC Yellow No. 11 is prone to nitrosation. Comprehensive characterization of its degradation products in formulations is currently lacking.

Conflicts

  • Nitrosating substances (due to its propensity for nitrosation)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1.1%
Sensitization risk Unknown

No specific CIR safety assessment has been conducted for HC Yellow No. 11. The SCCNFP evaluated its use up to a maximum of 1.1% in semi-permanent hair dye formulations, noting its susceptibility to nitrosation as a secondary alkanolamine. Information on nitrosamine content in the dye or final formulations, as well as the nature of its degradation products, remains uncharacterized. In the U.S., hair dyes containing 'coal tar' ingredients are typically exempt from certain FDA color additive provisions provided they carry a caution statement and patch test instructions.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Given its primary role as a hair colorant with no identified skin benefits, coupled with uncharacterized degradation products and a noted propensity for nitrosation, HC Yellow No. 11 is not recommended for precision skincare formulations.

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