The present invention provides a powder-containing composition which contains: an aqueous solvent, a cationic polymer in the aqueous solvent, and a powder with negative charge on the surface thereof in aqueous solvent and a BET specific surface area of less than 50m2/g. The mass ratio of the cationic polymer in the composition with respect to the total surface area of the powder in the composition is 1μg/m2 to 100,000μg/m2.本發明提供一種含有粉末之組成物，該含有粉末之組成物含有：水系溶劑、存在於水系溶劑中之陽離子性聚合物、及在水系溶劑中表面帶負電荷且具有未達50m2/g之BET比表面積之粉末。陽離子性聚合物在組成物中之質量相對於粉末在組成物中的總表面積的比為1μg/m2至100,000μg/m2。
