CI 77346

CI 77346 is a synthetic iron oxide pigment commonly referred to as yellow iron oxide. It is an inorganic colorant composed of iron oxide in a specific crystal form that produces a yellow hue. As a pigment rather than a dye, it remains largely on the skin surface and does not dissolve into the skin.In skincare and cosmetic products, CI 77346 serves primarily as a colourant to achieve desired shade effects, particularly in foundations, concealers, powders, and tinted treatments. It is approved for use in cosmetics across most major regulatory bodies, including the EU, US FDA, and UK legislation.

CI 77346 works as a colorant by sitting on the surface of the skin (and within the product matrix) and reflecting and absorbing light in a way that produces a yellow appearance. Because it is a pigment, it does not penetrate the skin barrier; instead, it creates a visual effect through light interaction.In formulations, iron oxide particles are finely milled to ensure even distribution and smooth application. Their small particle size allows them to blend seamlessly and provide consistent colour payoff without looking patchy or chalky.

CI 77346 is a passive ingredient that requires no special application method beyond using the product as directed. If using a product containing this pigment for colour correction or coverage, apply evenly with a brush, sponge, or fingers and blend thoroughly to avoid visible streaking or uneven patches. No particular timing or layering protocol is needed.

CI 77346 is generally well-tolerated across skin types and is not a known irritant or sensitiser. It is approved for use in cosmetics globally and suitable for sensitive skin, though always patch-test new products as a precaution.