Science
Mechanism of Action
This triarylmethane dye primarily provides aesthetic coloration, acting as a pH indicator and being redox-sensitive. While occasionally cited for pH balance, its verified primary function remains visual.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Evaluated at 0.1-0.2% in topical emulsions, confirming its properties as a washable, non-staining dye suitable for vehicle efficacy assessment.
- 02 Studies indicate increased transdermal absorption from hydrophilic vehicles if stratum corneum is compromised, such as by manual shaving.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Color is highly pH-dependent, stable as blue within pH 5.0-9.0, shifting to yellow-orange below pH 3.0. It is also redox-sensitive.
Conflicts
- Strongly acidic environments (pH < 3.0)
- Strong oxidizing agents
- Strong reducing agents
Safety
Safety Profile
Banned for hair dyes in the EU (Annex II/1356) but permitted in other EU cosmetics (Annex IV/60) under E 131 purity. Not listed by FDA for US cosmetic use.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An aesthetic colorant imparting a greenish-blue hue, suitable for various skin types and stable in specific pH ranges.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources