| abstract |
The present invention provides a black ink capable of alleviating the dependence on the image quality of a recording medium and stably providing a high quality image, which is (M1) 2 SO 4 , CH 3 COO (M1), Ph-COO (M1), (M1) NO 3 , (M1) Cl, (M1) Br, (M1) I, (M1) 2 SO 3 and (M1) 2 CO 3 , wherein M1 is an alkali metal, ammonium or organic Ammonium, and Ph is a phenyl group) and at least one salt selected from the group consisting of self dispersible carbon blacks. |