| 摘要 |
The present invention relates to a disazo compound or salt thereof, expressed by the following formula (1) (in the formula, Ar1 represents a phenyl group that is substituted with a hydroxy group or a methoxy group at the ortho position with regards to the azo group, and then substituted with a carboxyl group; and Ar2 represents a phenyl group that is substituted with a hydroxy group or a methoxy group at the ortho position with regards to the azo group, and which may then be substituted with a sulfonate group, sulfonamide group, or carboxyl group). |
