Science
Mechanism of Action
This compound functions by adhering directly to the hair surface, effectively imparting color. There are no reported mechanisms of action indicating any beneficial skincare effects for topical application.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The stability of HC Violet No. 1 has been observed at 0.5% in an aqueous carboxymethylcellulose suspension, maintaining content within ±5% over a 24-hour period. However, specific stability data within hair dye formulations are not available.
Conflicts
- Nitrosating agents (due to its secondary amine structure and propensity for nitrosation)
Safety
Safety Profile
HC Violet No. 1 has been reviewed by the SCCP/SCCS. It is permitted in semi-permanent hair dyes up to 0.28% and in oxidative formulations up to 0.5% (resulting in 0.25% on application). Acute dermal irritation studies in rabbits demonstrated temporary purple staining, very slight erythema, dermal capillary haemorrhage, and slight to severe oedema. The ingredient is classified as a Skin Sensitiser - Category 1. As a secondary amine, it is susceptible to nitrosation, though its specific nitrosamine content was not reported.
Your Skin
Skin Compatibility
Our Assessment
Verdict
HC Violet No. 1 is strongly discouraged for skincare due to a complete lack of demonstrated benefits, high sensitization risk, and documented dermal irritation.
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References
Sources