abstract |
An arylidene-pyrazolone dye of the following formula (1): n nwherein R 1 , R 2 , R 3 , R 4 and R 5 each independently represent a monovalent substituent; n indicates an integer of from 0 to 4; when n is 2 or more, plural R 3 's may be the same or different; and R 1 and R 2 may bond to each other to form a cyclic structure. |