Science
Mechanism of Action
On hair, Sodium Picramate acts as a non-reactive direct colorant, depositing pigment onto the outer layer of the hair. It does not engage in the chemical oxidation mechanism typical of permanent dyes. In terms of skin interaction, it does not possess a specific beneficial mechanism; its presence on skin is generally incidental to its use as a hair dye.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
Dry Sodium Picramate is highly explosive and poses a significant fire hazard. It mandates storage with a minimum of 20% water content to mitigate explosion risks, indicating critical handling precautions for the raw material rather than a common dusting concern in final product formulations.
The Formula
Formulation
Stability
Sodium Picramate solutions in water exhibit stability for at least 48 hours. It remains stable within hair dye formulations formulated at a pH range of 6.5 to 10. While stability in oxidative formulations is suggested, supporting data has not been provided. Maintaining the material in a wet state is crucial for safety to prevent explosion hazards.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel determined Sodium Picramate safe for use as a hair dye at specified concentrations, citing minimal skin absorption. The Scientific Committee on Consumer Safety (SCCS) considers it safe for non-oxidative hair dyes with an on-head concentration of up to 0.6%. However, it has been identified as a moderate skin sensitizer with an Estimated Concentration (EC3) of 6.7% in a Local Lymph Node Assay. Human and guinea pig studies also reported it as a mild sensitizer at concentrations around 0.2% (picramic acid equivalent), leading to a recommended safe use limit in general cosmetic products of 0.1%. Dry Sodium Picramate is highly explosive, requiring a minimum of 20% water for safe handling. GHS hazard statements include 'Toxic if swallowed', 'Harmful in contact with skin', 'May cause an allergic skin reaction', and 'Harmful if inhaled'.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Picramate is primarily a hair colorant with documented risks of skin sensitization and irritation, coupled with significant explosive hazards in its dry form, rendering it unsuitable for precision skincare formulations.
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