Science
Mechanism of Action
As a cationic molecule, it carries a positive charge that creates a strong electrostatic attraction to negatively charged (anionic) substrates, specifically the keratin found in hair and the surface layers of the epidermis. This charge-based bonding ensures efficient pigment deposition without deep chemical penetration, while its nature as a fluorophore allows it to exhibit green fluorescence under specific light conditions.
Research
Clinical Evidence
Medium confidence0.25%
Key findings
- 01 OECD TG 404 dermal irritation studies on concentrated forms showed no significant corrosion, though staining was persistent.
- 02 OECD TG 405 eye irritation testing classifies the pure substance as a Category 1 serious irritant.
- 03 Technical evaluations confirm coloration efficacy in the 0.001% to 0.5% range for wash-off and leave-on tinting products.
Transparency
Dusting Analysis
Because Basic Red 1:1 is a high-intensity colorant, it is effective at extremely low concentrations; however, levels below 0.001% may indicate it is being used for aesthetic product tinting rather than functional skin or hair staining.
The Formula
Formulation
Stability
Optimal stability is achieved in slightly acidic environments (pH 6.0). Extreme pH shifts toward highly alkaline or acidic ranges may result in pigment precipitation or visible shade alterations.
Synergies
- Non-ionic surfactants
- Cationic conditioning agents
Conflicts
- Anionic surfactants (e.g., Sodium Lauryl Sulfate)
- Strong oxidizing agents
- Strong reducing agents
Safety
Safety Profile
Classified as a Category 1 skin sensitizer. While safe at regulated cosmetic concentrations (up to 0.5%), the raw powder form is hazardous if inhaled and is a severe eye irritant.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An effective cationic dye for targeted color deposition, though its high sensitization potential requires strict adherence to concentration limits.
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