CI 77163

CI 77163 is a synthetic iron oxide pigment classified as a cosmetic colorant. It is approved for use in cosmetic products in the UK and EU, where it serves primarily as a colouring agent rather than a skin-active ingredient. The pigment consists of iron oxide particles that impart colour to formulations without intended therapeutic benefit to the skin.This ingredient appears in a small proportion of skincare products, typically where colour is desired for aesthetic or branding purposes. It is inert—meaning it does not chemically react with skin—and is used in very low concentrations.

CI 77163 functions as a passive colouring agent. The fine particles disperse throughout a formula and reflect and absorb light in ways that produce visible colour. It does not penetrate the skin barrier or interact with skin cells; it remains on the surface and is simply rinsed away during cleansing.

CI 77163 is formulated by manufacturers and requires no special consumer application technique. If using a coloured product containing this ingredient, apply as you would any other skincare formulation. The colour is cosmetic only and will not transfer to skin permanently.

CI 77163 is generally well-tolerated and considered safe for cosmetic use at approved concentrations. It is not known to be a common allergen or sensitiser, though individual sensitivities are possible.