Science
Mechanism of Action
Functions through ionic attraction, where the positively charged (cationic) molecules adhere to negatively charged surfaces like hair keratin. Its quaternary ammonium structure inhibits deep epidermal penetration, causing it to remain primarily on the surface of the substrate.
Research
Clinical Evidence
Low confidence0.4%
Key findings
- 01 Health Canada assessments identify 0.4% as the standard effective concentration for hair dyeing while noting slow dermal absorption.
- 02 Toxicological modeling in animal subjects indicates an oral LD50 of 0.33 g/kg, though carcinogenic evidence remains limited for this specific triarylmethane.
Transparency
Dusting Analysis
As a colorant with known safety concerns and zero therapeutic benefit, any presence in skincare is typically for aesthetic purposes rather than skin health.
The Formula
Formulation
Stability
Highly stable in acidic environments but prone to precipitation when exposed to strong bases or high pH shifts.
Conflicts
- Anionic surfactants (causes complexation)
- Strong oxidizing agents
- Sodium Hydroxide
Safety
Safety Profile
Explicitly banned for use in hair dyes in the EU (Annex II). Strictly regulated in Canada and California, with maximum limits of 0.2% in rinse-off products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Basic Violet 4 offers no biological benefit to the skin and is subject to international bans, making it inappropriate for precision skincare.
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Similar Ingredients
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References
Sources