Science
Mechanism of Action
This ingredient functions as a key component in the chemical process of oxidative hair dyeing. Upon activation by an oxidant, such as hydrogen peroxide, it participates in reactions with other dye intermediates to form the complex pigments responsible for hair color. It does not exhibit a direct mechanism of action beneficial for skin health; its interaction with skin is predominantly associated with potential irritation and sensitization.
Research
Clinical Evidence
Not-applicable confidenceN/A
Transparency
Dusting Analysis
This ingredient's primary function is as an oxidative hair dye, not a skincare active with beneficial dermal effects. Its documented potential for strong skin sensitization and irritation makes it unsuitable for 'dusting' in skincare formulations for perceived benefits.
The Formula
Formulation
Stability
A 10% (w/w) solution in water and acetone:water was stable for one week when stored in the dark at room temperature. Formulations with low pH may induce skin desquamation.
Conflicts
- nitrosating substances
Safety
Safety Profile
Regulatory bodies like the CIR and SCCS have deemed this ingredient safe for use in oxidative hair dye formulations, provided concentrations do not exceed 1.5% on-head after mixing and N-nitroso compound formation is prevented. It carries a significant risk of strong sensitization and allergic reactions, as highlighted by SCCS and ECHA. The FDA lists it as a 'coal tar hair dye' ingredient, necessitating specific caution statements and patch test instructions on product labels. Furthermore, its use with nitrosating substances is explicitly cautioned against due to susceptibility to N-nitrosation, with nitrosamine content requiring limitation to less than 50 ppb.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given its primary function as an oxidative hair dye and documented strong sensitizing potential, coupled with significant irritation risks and regulatory restrictions, this ingredient is not recommended for direct inclusion in skincare formulations.
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References
Sources