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Moumoujus

CI 77163.

Valuable CAS 7787-59-9 / COLORANT

CI 77163, also known as Bismuth Oxychloride, is a cosmetic pigment and opacifying agent primarily valued for imparting a distinct pearlescent and luminous finish to skincare formulations. While it enhances product texture and adhesion, its crystalline structure necessitates careful formulation to prevent potential irritation, particularly for sensitive or acne-prone skin.

Summary

Colorant Pigment Brightening Agent Opacifying Agent Pearlescent Agent Texturizer Adhesion Enhancer Light Diffuser

Science

Mechanism of Action

Bismuth Oxychloride creates a pearlescent, luminous, and shimmering effect due to its unique plate-like crystalline structure, which interacts with light waves. Beyond its brightening and opacifying properties, it enhances formulation texture by providing a smooth, silky feel, and contributes to product binding, compressibility, and improved skin adhesion through its layered structure and facile lateral cleavage. It can also subtly camouflage fine lines by diffusing light away from the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Concentrations below 0.1% in eyeshadows are associated with very rare allergic reactions, whereas higher concentrations in mineral-based powder foundations can lead to increased potential for allergic reactions and irritation.

Transparency

Dusting Analysis

Commonly dusted

The plate-like crystalline structure of Bismuth Oxychloride can physically irritate skin by 'poking' or becoming lodged in pores, particularly when applied in higher concentrations or with vigorous buffing, as is common with mineral powders. This mechanical irritation is a primary concern for sensitive, acne-prone, or rosacea-affected skin, contributing to redness and inflammation.

The Formula

Formulation

Solubility
Unknown
Optimal pH 2 – 12
0 7 14

Stability

CI 77163 is chemically stable within a broad pH range of 2 to 12. It becomes soluble in strong acids at pH values significantly below 2, and above pH 12, it gradually converts into bismuth oxide or subhydroxide. Prolonged exposure to UV light can lead to a reversible loss of its characteristic sheen and a gray discoloration.

Conflicts

  • UV light exposure (potential loss of sheen and graying)

Safety

Safety Profile

CIR Status
Deferred evaluation
Sensitization risk Moderate

Regulatory bodies generally consider Bismuth Oxychloride safe for cosmetic use, with the FDA listing it as a certification-exempt color additive, permitted for use in the eye area but not in lip products, and requiring ≥98% purity. The EU also allows its use as a coloring agent without restriction. However, its crystalline structure has been linked to potential irritation for individuals with very sensitive skin, acne-prone skin, or rosacea. Over-buffing mineral makeup containing this ingredient can exacerbate irritation and inflammation.

Your Skin

Skin Compatibility

Yes Normal
No Dry
No Oily
No Sensitive
Irritancy Moderate
Comedogenicity Moderate

Our Assessment

Verdict

Valuable

CI 77163 is a valuable ingredient for achieving luminous, pearlescent cosmetic finishes and enhancing product texture, though its formulation and application require careful consideration to mitigate potential irritation risks for sensitive skin types.

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