Agent comprises: a first composition (A) comprising one or more alkalizing agent, and a second composition (B) comprising one or more oxidizing agent, where at least one of the two compositions (A), and (B) comprises one or more fatty body free of carboxylic acid group, the total quantity of fatty body in the mixture of the compositions (A), and (B) is less than 20 wt.%, and at least one of the two compositions (A) and (B) comprises one or more sequestering agent (I). Agent comprises: a first composition (A) comprising one or more alkalizing agent, and a second composition (B) comprising one or more oxidizing agent, where at least one of the two compositions (A), and (B) comprises one or more fatty body free of carboxylic acid group, the total quantity of fatty body in the mixture of the compositions (A), and (B) is less than 20 wt.%, at least one of the two compositions (A) and (B) comprises one or more sequestering agent of formula (R3)(R4)(N)-(CH 2) n-(Y1) p-(CH 2) m-N(R1)(R2) (I). p : 0 or 1 n : 0, 1 or 2, where the sum of n+m is at least 1 R1-R4 : H, -CH 2CO 2M1 or -CH(CO 2M2)(CH 2CO 2M3) Y1 : NCH 2CO 2M4 and M1-M4 : H, cation from alkaline metal or alkaline earth metal, cation from optionally hydroxylated organic amine, or ammonium cation, preferably sodium or potassium cation. Provided that, if p is 0, then R1 and R3 are H, and R2 and R4 are -CH(CO 2M2)(CH 2CO 2M3), and if p is 1, then n and m are at least 1. Independent claims are included for: (1) a process for coloring and/or bleaching the keratin material comprising applying the compositions (A) and (B) on the dry or wet keratin material, without intermediate rinsing step and (2) a multi compartment device or kit for coloring and/or bleaching, comprising a first compartment comprising the first composition (A) and a second compartment comprising the second composition (B).La présente invention concerne un agent de coloration et/ou de décoloration des fibres kératiniques, constitué par :- une première comp
