Science
Mechanism of Action
This ingredient operates via direct deposition onto the skin surface, where its relatively small molecular structure allows for temporary staining or superficial color impartation. It does not engage in oxidative reactions or exhibit active biological mechanisms relevant to skin health.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
HC Yellow No. 10 is primarily a colorant and not an active ingredient typically associated with 'dusting' or concentration-dependent skincare efficacy thresholds.
The Formula
Formulation
Stability
Specific optimal pH ranges for stability within cosmetic formulations are not available. Raw material testing indicates satisfactory stability in controlled environments (e.g., specific solvents, protected from light and inert gas) over short to medium durations. Data concerning its stability in finished marketed products remains unprovided.
Conflicts
- Nitrosating substances (as a secondary amine, it is prone to forming nitrosamines)
Safety
Safety Profile
The SCCP (a predecessor to SCCS) concluded that an on-head concentration of up to 0.1% as a semi-permanent hair dye does not pose a consumer health risk. However, as a secondary amine, it is susceptible to nitrosation; products must contain less than 50 ppb of nitrosamines and should not be formulated with nitrosating agents. Its FDA status as a 'coal tar' hair dye necessitates specific labeling and a pre-application patch test for potential irritation, rather than general approval for skincare.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Primarily a cosmetic colorant with no demonstrated skincare efficacy, HC Yellow No. 10 carries a moderate irritation risk and requires strict formulation control due to its potential for nitrosamine formation, making its inclusion in precision skincare products questionable.
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References
Sources