Science
Mechanism of Action
HC Red No. 10 operates as a direct hair dye, imparting color by physically adhering to the hair's surface. For semi-permanent effects, it diffuses into the hair cortex without undergoing chemical reactions with hair components. Its designated function is specific to hair coloration, with no described mechanism for direct skin treatment.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
For optimal color stability in formulations, precise pH control is crucial, often involving buffering between pH 9.0 and 6.0. While it possesses a water solubility of 1.734 g/L, nitro aniline dyes like HC Red No. 10 frequently necessitate glycols or glycol derivatives, such as glycerin, for effective solubilization and optimal performance in formulations.
Conflicts
- Incompatible with N-nitrosating agents, as this can lead to the formation of carcinogenic nitrosamines. Formulations must limit nitrosamine content to below 50 ppb.
Safety
Safety Profile
The Scientific Committee on Consumer Safety (SCCS) concluded that HC Red No. 10, when co-used with HC Red No. 11, does not pose a health risk at a maximum on-head concentration of 1.0% in oxidative hair dye formulations and 2.0% in non-oxidative formulations. It is restricted under Annex III of the EC Cosmetics Regulation. Skin sensitization is not expected at typical use concentrations, though potential at higher concentrations cannot be entirely excluded. EWG rates it with 'Low Allergies & Immunotoxicity'. Its FDA status for cosmetics is not explicitly listed, and it is distinct from D&C Red No. 10.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given its specific function as a hair dye and the absence of detailed information regarding its direct benefits or mechanisms for skin health within the provided research, its utility for precision skincare applications remains unsupported.
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References
Sources