| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dilution solution which enhances dispersion efficiency to ink and realizes high-quality density gradations, by preparing the dilution solution which is mixed with ink with a predetermined mixture ratio immediately before discharged, and discharged and adhered onto a recording medium of one that contains a heterocyclic compound including nitrogen. SOLUTION: An ink and a dilution solution are mixed with a predetermined mixture ratio immediately before discharged, and discharged and adhered onto a recording medium, thereby obtaining high-quality density gradations in recorded images. In this case, the dilution solution is prepared of one that contains a heterocyclic compound including nitrogen. The heterocyclic compound used is expressed by a formula (wherein R is a hydrogen atom, a methyl group, a vinyl group or the like). The heterocyclic compound is added by 0.5-50 wt.% to the dilution solution. Water and a water-soluble organic solvent may be added to the dilution solution, and the water-soluble organic solvent is preferably ethyl alcohol, i-propyl alcohol. |
