Science
Mechanism of Action
As a cationic dye, Basic Red 1 operates through electrostatic adsorption, bonding to negatively charged surfaces such as the skin or hair keratin. It adheres to the outer layers or diffuses deeper into structural fibers depending on the delivery vehicle, providing immediate visual pigmentation.
Research
Clinical Evidence
Medium confidence2%
Key findings
- 01 Determined as the Effective Concentration (EC3) for skin sensitization in LLNA assays, marking it as a Category 1B sensitizer.
- 02 Pure material caused irreversible ocular damage and corneal opacification in animal models.
Transparency
Dusting Analysis
Because it is a potent colorant, even trace amounts (dusting) will significantly alter a formula's appearance; however, its use in skincare is rare due to FDA non-permitted status for general cosmetics.
The Formula
Formulation
Stability
Exhibits robust stability across a wide pH spectrum but is prone to moderate photodegradation. Best stability is typically found in acidic environments between pH 3.0 and 5.0.
Conflicts
- Strong oxidizing agents
- Anionic surfactants (leads to precipitation or complex formation)
Safety
Safety Profile
Classified as a Category 1B skin sensitizer. It is a non-permitted color additive for general cosmetic use by the FDA, especially concerning the eye area.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While effective for hair coloration, its status as a skin sensitizer and FDA non-permitted status make it unsuitable for precision skincare.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources