PRODUCTION OF GRANULAR RHODAMINE DYE

PROBLEM TO BE SOLVED: To obtain a Rhodamine dye having a suitable granular form and a remarkably low content of an ungranulated powder by mixing a Rhodamine dye solution and a salt solution each of which is prepared by dissolution in water and/or a solvent at a high temperature and cooling the mixture in a molten state. SOLUTION: A solution prepared by dissolving Rhodamine dye in at least either water or a solvent at a high temperature, desirably, 55-98 deg.C and having a high concentration, desirably, 20-60 wt.% is mixed with a solution prepared by dissolving a salt in at least either water or a solvent at a high temperature, desirably, 60-98 deg.C and having a high concentration, desirably, 10-25 wt.% to form a mixed solution having a temperature of, desirably, at least 60 deg.C and being in a molten state, i.e., a state in which the dye takes an oily form and is separated from the aqueous medium. The solvent used is exemplified by an aliphatic alcohol, an aromatic alcohol, a ketone, an ester, an ether, an amine, or an organic acid, and the salt used is exemplified by NaCl, KCl, ZnCl2, or NH4Cl.