Eyeliner is made of three main ingredients: film formers, pigments and thickeners. The film former deposits a thin layer to the skin to help the makeup stick.
Eyeliner comes in pencil, liquid, gel and cream forms. The pigments are the ingredients that give the eyeliner its color. Common colors are brown, black and blue, although other colors are available. The thickeners are often made from waxes or clay. These add substance to the eyeliner so that it adheres to the skin. Some eyeliners also contain other ingredients, depending on the brand, and some even contain metallic flakes for a shinier look.