PROBLEM TO BE SOLVED: To provide a standard substance containing novel standard particles that can be stained to the same extent to measured particles and are different from the conventional types.;SOLUTION: This standard substance for a particle analyzer used in the particle analyzer of staining-treating the measured particle contained in a specimen with a water-soluble pigment, and of analyzing the stained measured particles contains the standard particles that are prepared by coating particles that are not substantially stained by the water-soluble pigment with a water-soluble polymer, and the standard particles are stained to the same extent as the measured particles by the staining treatment.;COPYRIGHT: (C)2007,JPO&INPIT
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