Science
Mechanism of Action
This direct anionic dye functions via physical adsorption onto the hair or skin surface, rather than chemical reaction. Its large molecular size and sulfonic acid group limit penetration, keeping it in the stratum corneum for temporary color.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 A 0.5% concentration estimated dermal absorption at 0.47 µg/cm² (0.46% of applied dose), though SCCS assumes 100% absorption for safety.
- 02 A 1.5% aqueous solution caused slight conjunctival irritation but no irritation to iris or cornea in an ocular study.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Stable for up to 7 years when stored dry and protected from light. In aqueous solutions, it is stable for at least 4 hours under inert gas, with approximately 5% degradation occurring over 8 days.
Conflicts
- Nitrosating agents
- Strong oxidizing agents
- Cationic surfactants
Safety
Safety Profile
The SCCS deems it safe up to 0.5% in hair dyes, though EU Annex IV restricts its use to products with short skin contact (Category 4). As a secondary amine, it must not be combined with nitrosating agents due to nitrosation potential.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Acid Blue 62 is an optional colorant for temporary pigmentation, requiring careful formulation to avoid incompatibilities and adherence to restricted use guidelines.
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References
Sources