An extruded particle comprising: (a) at least one bleaching agent comprising 6-phthalimido-peroxy-hexanoic acid; (bi) at least one component selected from: potato starch, pregellatinised potato starch, maize starch, wheat starch, rice starch and partially pregellatinised maize starch; or sucrose, mannitol, isomalt, xylitol, sorbitol, trehalose and lactitol; (bii) at least one component selected from: a linear, branched or cross-linked polymer or copolymer selected from polyvinylpyrrolidone, a functionalised poly(vinyl) alcohol, a linear, branched or cross-linked polymer or copolymer prepared from one or more of the following monomers: (meth)acrylic acid, acrylic acid, maleic acid, fumaric acid, itaconic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, vinyl alcohol and vinyl acetate; or polyvinylpyrrolidone, polyacrylic acid, poly(meth)acrylic acid and cross-linked polyacrylic acid; (c) at least one pH reducing agent selected from citric acid, tartaric acid, tartronic acid, malonic acid, oxalic acid, maleic acid, itaconic acid, fumaric acid, hydrochloric acid, sulfuric acid, phosphoric acid, gluconic acid, lactic acid, toluene sulfonic acid, ascorbic acid, acetic acid and methane sulfonic acid; and (d) at least one chelating agent selected from ethylenediaminetetraacetic acid (EDTA), glutamic acid diacetic acid (GLDA), diethylene triamine pentaacetic acid (DTPA), hydroxyethylethylenediaminetriacetic acid (HEDTA), nitrilotriacetic acid, ethanoldiglycinic acid, 2,2',2",2"'-(1,2-propanediyldinitrilo)tetraacetic acid (PDTA), glucoheptonate, N,N-bis(carboxymethyl)-L-glutamic acid, nitroacetic acid, phosphoric acid and polymers of phosphoric acid, aminopolyphosphonic acid, diethylenetrianime penta(methylenephosphonic acid) (DTPMP), azacycloheptane diphosphonate, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), diethylenetriamine penta(methylene phosphonic acid), polyamino phosphonic acid, bis(hexamethylene triamine penta(methylenephosphonic acid)), the sodium salt of diethylene triamine penta (methylene phosphonic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid and amino tri(methylene phosphonic acid) (ATMP). (a) at least one bleaching agent comprising 6-phthalimido-peroxy-hexanoic acid; (bi) at least one component selected from: potato starch, pregellatinised potato starch, maize starch, wheat starch, rice starch and partially pregellatinised maize starch; or sucrose, mannitol, isomalt, xylitol, sorbitol, trehalose and lactitol; potato starch, pregellatinised potato starch, maize starch, wheat starch, rice starch and partially pregellatinised maize starch; or sucrose, mannitol, isomalt, xylitol, sorbitol, trehalose and lactitol; (bii) at least one component selected from: a linear, branched or cross-linked polymer or copolymer selected from polyvinylpyrrolidone, a functionalised poly(vinyl) alcohol, a linear, branched or cross-linked polymer or copolymer prepared from one or more of the following monomers: (meth)acrylic acid, acrylic acid, maleic acid, fumaric acid, itaconic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, vinyl alcohol and vinyl acetate; or polyvinylpyrrolidone, polyacrylic acid, poly(meth)acrylic acid and cross-linked polyacrylic acid; a linear, branched or cross-linked polymer or copolymer selected from polyvinylpyrrolidone, a functionalised poly(vinyl) alcohol, a linear, branched or cross-linked polymer or copolymer prepared from one or more of the following monomers: (meth)acrylic acid, acrylic acid, maleic acid, fumaric acid, itaconic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, vinyl alcohol and vinyl acetate; or polyvinylpyrrolidone, polyacrylic acid, poly(meth)acrylic acid and cross-linked polyacrylic acid; (c) at least one pH reducing agent selected from citric acid, tartaric acid, tartronic acid, malonic acid, oxalic acid, maleic acid, itaconic acid, fumaric acid, hydrochloric acid, sulfuric acid, phosphoric acid, gluconic acid, lactic acid, toluene sulfonic acid, ascorbic acid, acetic acid and methane sulfonic acid; and (d) at least one chelating agent selected from ethylenediaminetetraacetic acid (EDTA), glutamic acid diacetic acid (GLDA), diethylene triamine pentaacetic acid (DTPA), hydroxyethylethylenediaminetriacetic acid (HEDTA), nitrilotriacetic acid, ethanoldiglycinic acid, 2,2',2",2"'-(1,2-propanediyldinitrilo)tetraacetic acid (PDTA), glucoheptonate, N,N-bis(carboxymethyl)-L-glutamic acid, nitroacetic acid, phosphoric acid and polymers of phosphoric acid, aminopolyphosphonic acid, diethylenetrianime penta(methylenephosphonic acid) (DTPMP), azacycloheptane diphosphonate, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), diethylenetriamine penta(methylene phosphonic acid), polyamino phosphonic acid, bis(hexamethylene triamine penta(methylenephosphonic acid)), the sodium salt of diethylene triamine penta (methylene phosphonic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid and amino tri(methylene phosphonic acid) (ATMP).