Abstract: The instant disclosure generally relates to a bicomponent composition for coloring mammalian or synthetic keratin fibers, the bicomponent composition comprising first, second, components. The first component includes an organic polymer, the second component includes a pretreatment base compound. One or more of the components includes pigment microparticles. The bicomponent composition combines upon application to treated material such as hair, forms a solid coating thereon and has a substantially long color fastness following development (setting). Methods of using such compositions are also described herein.