Science
Mechanism of Action
This compound acts as an oxidative hair dye ingredient. Its mechanism involves reacting with a coupler in the presence of an oxidant, such as hydrogen peroxide, to form the active dye molecules. These molecules then penetrate and color the hair shaft, providing permanent coloration.
Research
Clinical Evidence
High confidence3%
Key findings
- 01 SCCS Opinion on Hair Dye Substances
- 02 CIR Safety Assessment of Hair Dye Ingredients
Transparency
Dusting Analysis
This ingredient is typically formulated into liquid or cream-based hair dye products rather than being used as a dry powder in skincare, making 'dusting' considerations largely irrelevant for its application.
The Formula
Formulation
Stability
The substance exhibits notable stability, maintaining its integrity for three years at 25°C and 50% relative humidity, and one year at 40°C and 75% relative humidity with less than 6% variation. A 3% concentration within a typical hair coloring cream also demonstrated stability under these conditions.
Conflicts
- Oxidizing agents (reacts with them as part of its intended function, requiring controlled formulation)
- Nitrosating agents (potential for N-nitroso chemical formation, though deemed not relevant for its regulated hair dye use)
Safety
Safety Profile
The CIR Expert Panel and SCCS concluded this ingredient is safe for its intended use and concentrations in oxidative hair dye formulations, specifically up to a 3.0% maximum on-head concentration post-mixing. The FDA classifies it as a 'coal tar hair dye product,' exempting it from certain provisions provided labels include caution statements and patch test instructions, highlighting its specific regulatory framework and potential for individual sensitivity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While safely and effectively used as an oxidative hair dye ingredient in specific applications, 1-Hydroxyethyl 4,5-Diamino Pyrazole Sulfate is not suitable for precision skincare formulations due to its high irritancy potential and lack of reported direct skin benefits.
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References
Sources