What ingredient is commonly used to create a glitter or iridescent effect in face powders?

Fine aluminium powder is commonly used to create a glitter or iridescent effect in face powders due to its unique reflective properties. When incorporated into makeup formulations, it can produce a shiny or glittery finish that enhances the overall appearance of the product, making the skin appear more luminous and radiant. Its fine particle size allows it to blend smoothly into cosmetic applications, ensuring an even distribution of shimmer without feeling heavy or gritty on the skin.

The other ingredients listed serve different purposes in cosmetic formulations. Shea butter, for example, is primarily used for its moisturizing and emollient properties, providing hydration and a smooth texture. Titanium dioxide is generally utilized as a pigment and sunblock agent, offering opacity and UV protection rather than a shimmering effect. Iron oxide is primarily used for coloring, best known for providing pigmentation and depth to makeup products. Each ingredient plays a vital role based on specific desired outcomes in makeup formulations, reinforcing the importance of including the right component for the intended effect.