阅读说明：本技术 部花青结晶方法 (Method for crystallizing merocyanine ) 是由 B·温克勒 L·西蒙 于 2019-07-09 设计创作，主要内容包括：本发明涉及一种制备结晶部花青化合物的方法,包括将部花青化合物溶于极性有机溶剂中的步骤,其中该方法在pH小于7下在酸存在下进行,其中消除有色杂质的残留水平。(The present invention relates to a process for the preparation of a crystalline merocyanine compound comprising the step of dissolving the merocyanine compound in a polar organic solvent, wherein the process is carried out at a pH of less than 7 in the presence of an acid, wherein residual levels of colored impurities are eliminated.)