PROBLEM TO BE SOLVED: To provide a pigment granule by which a detergent can be prevented from being colored while being stored and coloring of foam can be quickly developed during washing, a manufacturing method of the same, the detergent including the pigment granule, and a method of coloring foam during washing.SOLUTION: [1] A pigment granule comprises a pigment, a polyvinyl pyrrolidone, and a polyvinyl alcohol. The pigment granule has a core-shell structure in which a core part thereof includes the pigment and the polyvinyl pyrrolidone, and a shell part thereof includes the polyvinyl alcohol. [2] A detergent includes the pigment granule. [3] A manufacturing method of the pigment granule comprises: a step A of adding (b) the polyvinyl pyrrolidone solution to (a) powder including a pigment to granulate and a step B of adding (c) a polyvinyl alcohol solution to the obtained granule to granulate. [4] A method of coloring foam during washing uses the pigment granule.COPYRIGHT: (C)2014,JPO&INPIT【課題】洗浄剤の保存時には着色を抑制し、洗浄時には速やかに泡を発色させることができる色素顆粒、その製造方法、該色素顆粒を含有する洗浄剤、及び洗浄時の泡の着色方法を提供する。【解決手段】[1]色素、ポリビニルピロリドン及びポリビニルアルコールを含有する色素顆粒であって、コア部に色素とポリビニルピロリドンを含有し、シェル部にポリビニルアルコールを有するコアシェル構造の色素顆粒、[2]前記の色素顆粒を含有する洗浄剤、[3](a)色素を含有する粉体に(b)ポリビニルピロリドン溶液を添加し造粒する工程A、及び得られた造粒物に(c)ポリビニルアルコール溶液を添加し造粒する工程Bを有する、色素顆粒の製造方法、並びに[4]前記の色素顆粒を用いる、洗浄時の泡の着色方法である。【選択図】なし
