Science
Mechanism of Action
This ingredient functions exclusively as a colorant, providing a red pigment to formulations. It offers no known beneficial biological mechanisms or therapeutic effects for the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
No data available regarding dusting properties for this ingredient.
The Formula
Formulation
Stability
Based on related compounds (Solvent Red 49 and Pigment Red 49:1), this ingredient is generally stable under typical temperatures and pressures, exhibiting good resistance to light and heat up to 180°C. A 1% solution of Solvent Red 49 shows a pH range of 6.0-8.0, while Pigment Red 49:1 is stable around pH 7.0-9.0.
Conflicts
- Strong oxidizing agents
- Strong reducing agents
- Excess heat
Safety
Safety Profile
Solvent Red 49:1 (Rhodamine B-Stearate) is explicitly prohibited or deemed unsafe for cosmetic use by major regulatory bodies, including Health Canada and the EU Cosmetics Directive, and is listed as unacceptable for EWG VERIFIED products. A closely related compound, Solvent Red 49, is classified as harmful if ingested, causes skin irritation, and serious eye damage. Furthermore, mutagenicity data has been reported for Solvent Red 49, raising significant toxicological concerns.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Solvent Red 49:1 is a prohibited colorant in cosmetics due to significant safety risks, including high skin irritancy and potential mutagenicity, rendering it unsuitable for any skincare formulation.
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