A product for oxidatively changing the color of keratin fibers, comprising at least two preparations and packaged separately from one another, wherein - the first preparation contains, in a cosmetic carrier, hydrogen peroxide, and at least one chelating agent from the group consisting of 1-hydroxyethane-1,1-diphosphonic acid (HEDP), ethylenediamine tetramethylene phosphonic acid (EDTMP), diethylenetriamine pentamethylene phosphonic acid (DTPMP), aminotrimethylene phosphonic acid (ATMP), N,N-bis[2-[bis(carboxymethyl)amino]ethyl]glycine, ethylenediamine-N,N'-disuccinic acid (EDDS), 2-hydroxypropylene diamine-N,N'-disuccinic acid (HPDDS), ethylenediamine-N,N'-diglutaric acid (EDDG), ethylenediamine-N,N'-bis-(orthohydroxyphenyl) acetic acid (EDDHA) and/or a physiologically acceptable salt thereof, - the second preparation contains, in a cosmetic carrier, at least one alkalizing agent, - preparation is packaged in a first container (container A) which comprises at least two layers, wherein - an inner layer of container A comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container A comprises a layer made of metal, and - preparation is packaged in a second container (container B) which comprises at least two layers, wherein - an inner layer of container B comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container B comprises a layer made of metal, - the first container (container A) and the second container (container B) are located together inside a pressurized aerosol container, - the pressurized aerosol container has an outlet opening which is connected to container and to container, and - the space between the outer walls of the two containers and and the inner wall of the pressurized aerosol container is filled with at least one propellant. - the first preparation contains, in a cosmetic carrier, hydrogen peroxide, and at least one chelating agent from the group consisting of 1-hydroxyethane-1,1-diphosphonic acid (HEDP), ethylenediamine tetramethylene phosphonic acid (EDTMP), diethylenetriamine pentamethylene phosphonic acid (DTPMP), aminotrimethylene phosphonic acid (ATMP), N,N-bis[2-[bis(carboxymethyl)amino]ethyl]glycine, ethylenediamine-N,N'-disuccinic acid (EDDS), 2-hydroxypropylene diamine-N,N'-disuccinic acid (HPDDS), ethylenediamine-N,N'-diglutaric acid (EDDG), ethylenediamine-N,N'-bis-(orthohydroxyphenyl) acetic acid (EDDHA) and/or a physiologically acceptable salt thereof, hydrogen peroxide, and at least one chelating agent from the group consisting of 1-hydroxyethane-1,1-diphosphonic acid (HEDP), ethylenediamine tetramethylene phosphonic acid (EDTMP), diethylenetriamine pentamethylene phosphonic acid (DTPMP), aminotrimethylene phosphonic acid (ATMP), N,N-bis[2-[bis(carboxymethyl)amino]ethyl]glycine, ethylenediamine-N,N'-disuccinic acid (EDDS), 2-hydroxypropylene diamine-N,N'-disuccinic acid (HPDDS), ethylenediamine-N,N'-diglutaric acid (EDDG), ethylenediamine-N,N'-bis-(orthohydroxyphenyl) acetic acid (EDDHA) and/or a physiologically acceptable salt thereof, - the second preparation contains, in a cosmetic carrier, at least one alkalizing agent, - preparation is packaged in a first container (container A) which comprises at least two layers, wherein - an inner layer of container A comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container A comprises a layer made of metal, and - an inner layer of container A comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container A comprises a layer made of metal, and - preparation is packaged in a second container (container B) which comprises at least two layers, wherein - an inner layer of container B comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container B comprises a layer made of metal, - an inner layer of container B comprises a layer made of a synthetic polymer from the group of polyolefins, and - an outer layer of container B comprises a layer made of metal, - the first container (container A) and the second container (container B) are located together inside a pressurized aerosol container, - the pressurized aerosol container has an outlet opening which is connected to container and to container, and - the space between the outer walls of the two containers and and the inner wall of the pressurized aerosol container is filled with at least one propellant.