| abstract |
PURPOSE: To allow a crystal to be isolated in a short time and with ease by using a fluoran compound useful as a coloring compound and a specific organic solvent. n CONSTITUTION: A fluoran compound represented by the formula is isolated by recrystallization from an organic solvent containing 50wt.% or more, preferably 80wt.% or more, methanol, ethanol or acetonitrile. This compound has strong peaks at diffraction angles (2 θ) of 7.7°, 13.1°, 17.4°, 20.3° and 20.5° in an X ray diffraction method using Cu-Kα radiation. n COPYRIGHT: (C)1992,JPO&Japio |