Fecha de publicación: 05/01/2023 Fuente: WIPO Rice The present invention relates to a cosmetic composition for treating keratin fibres, notably human keratin fibres such as the hair, comprising N,N-dicarboxymethylglutamic acid, and/or salts thereof, solvates thereof and/or solvates of the salts thereof, 1,3-propanediol, at least one nonionic-surfactant chosen from (C6-C24 alkyl)polyglycosides, esters of C8-C30 fatty acids and of (poly)oxyalkylenated glycerol ethers, in particular of oxyethylenated and/or oxypropylenated glycerol ethers, and mixtures thereof, at least one alkaline agent and/or at least one dye. The present invention also relates to a process for dyeing and/or lightening keratin fibres, such as the hair, in which a composition comprising N,N-dicarboxymethylglutamic acid, and/or salts thereof, solvates thereof and/or solvates of the salts thereof, 1,3-propanediol, at least one nonionic surfactant, at least one alkaline agent and/or at least one dye is applied to said fibres. The present invention also relates to the use of the composition according to the invention for dyeing and/or lightening keratin fibres such as the hair.