Agent for lightening keratin fibers and method for changing the color of keratinic fibers are provided herein. In an embodiment, an agent for lightening keratin fibers includes, relative to the weight thereof, a) from about 0.01 to about 5 wt % ethyl cellulose, b) from about 5 to about 70 wt % oil component(s), c) from about 1 to about 70 wt % peroxydisulphate(s) from the group of sodium peroxydisulphate and/or potassium peroxydisulphate and/or ammonium peroxydisulphate.
