Science
Mechanism of Action
In hair dye systems, Picramic Acid (pKa ~4) transitions to its basic form, picramate, under typical alkaline conditions (pH 6.5-10). This picramate species directly binds to hair fibers, resulting in color deposition. No analogous mechanism of action for skin benefit has been identified or reported.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
Picramic Acid is an industrial colorant with no documented active properties or recognized utility in precision skincare formulations, precluding its consideration as a 'dusted' ingredient.
The Formula
Formulation
Stability
Picramic Acid is intrinsically stable but presents a dangerous fire risk due to combustibility. It must be protected from shock, friction, and heat. In its dry state, it is explosive, necessitating desensitization through wetting. Its long-term stability within typical oxidative hair dye environments is not consistently established.
Conflicts
- strong oxidizing agents
- shock
- friction
- heat
Safety
Safety Profile
The CIR Expert Panel deems Picramic Acid safe for use in hair dye formulations at reported concentrations, while explicitly noting its sensitizing potential. The SCCS permits a maximum on-head concentration of 0.6% in hair dyes, also emphasizing sensitization risk and requiring a warning in the EU. It is not expected to be irritating to skin at 2.5% in aqueous solution but is mildly irritating to eyes at the same concentration. Skin absorption from hair dye products is reported as poor. In Canada, Sodium picramate, a related compound, is restricted to a maximum of 0.1% and carries acute toxicity warnings.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Picramic Acid is a hair dye with significant sensitization risk and no documented benefits or safe use cases for precision skincare, thus it should be avoided in topical skin formulations.
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References
Sources