Science
Mechanism of Action
As a cosmetic colorant, CI 77266 imparts a deep black color to formulations through its optical properties, absorbing and reflecting incident light. Its inert nature means it does not interact chemically with the skin, serving solely as a pigment.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Demonstrated zero cytotoxicity in human fibroblast cultures, indicating safety for topical application up to a 5% concentration.
Transparency
Dusting Analysis
While Carbon Black can be found in some powder-based cosmetics, scientific committees advise against its use in products like powders and perfumes due to potential inhalation toxicity. The IARC classifies Carbon Black as a Group 2B carcinogen, primarily linked to inhalation exposure, often due to impurities. Moumoujus prioritizes safe topical application, avoiding forms that pose inhalation risks.
The Formula
Formulation
Stability
CI 77266 exhibits robust stability against temperature fluctuations and light exposure. Being insoluble in water, it requires careful dispersion in both water and oil phases, typically facilitated by surfactants or emulsifiers for optimal incorporation into formulas. No specific pH range has been identified as critical for its stability.
Conflicts
- Avoid use in products where inhalation exposure is likely (e.g., loose powders, aerosol sprays, perfumes).
- Formulations incorporating CI 77266 necessitate comprehensive preservation systems to manage potential microbial proliferation.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deferred evaluation. However, the SCCS has deemed nano-structured CI 77266 (≥20 nm) safe for use on healthy, intact skin up to 10% concentration as a colorant, with the critical caveat that this excludes applications leading to inhalation. In the U.S., Black 2 is FDA-certified and must meet strict purity specifications, notably for limiting impurities like PAHs, arsenic, lead, mercury, and sulfur. Typical use ranges in the EU are 0.001% for skin products, 5% for mascaras, and up to 10% for other eye decorative items. The IARC's classification as a Group 2B carcinogen is predominantly associated with inhalation risks, often stemming from impure forms of Carbon Black.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 77266 is a valuable colorant for achieving deep black shades in topical formulations, provided it is used within safe concentration limits and in product forms that eliminate inhalation risk.
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References
Sources