Agents for coloring keratin-containing fibers, in particular human hair, that contain encased oxidation dye precursor products. More-uniform coloring, which is independent of which strands are wetted first or last with the coloring product, is thereby ensured. The casing of the oxidation dye precursor products is made up of an encapsulating material made of methacrylic-acid, methacrylic acid-ester, or vinyl-acetate homo- or copolymers, or shellac, as well as at least one release agent. Contact time is equalized over time and shortened overall, resulting in a reduction in hair damage due to excessively long contact times. A method for manufacturing coloring agents for keratinic fibers, containing coated particles is also provided.