Processes for lightening keratinic fibers are provided. In an exemplary process a ready-to-use lightening composition is produced by, immediately prior to application, combining a composition (A) comprising an alkalizing agent, a composition (B) comprising an oxidizing agent, and a composition (C) comprising a peroxo salt, and then mixing. The ready-to-use lightening composition is deployed from a foam dispensing vessel and distributed onto the fibers. The ready-to-use lightening composition is left on the fibers for a period of about 1 to about 60 min. and is washed out of the fibers.
