| abstract |
(57) [Abstract] [Purpose] Use a light source with an emission wavelength near 650 nm, A recording material suitable for OCR reading is provided. Further, it is mixed with another dye to provide a recording material showing a black color tone. [Structure] General formula (1) (In the formula, R 1 represents an alkyl group having 1 to 5 carbon atoms, and X 1 Represents hydrogen, methyl group, methoxy group, ethoxy group or chlorine). Further, the phthalide compound and the fluoran compound are mixed to obtain a recording material showing a black color tone. |