Patent ID: 8616698

Claim:
An evaluation method for evaluating a pigment ink for ink jet recording which is used together with a dye ink for ink jet recording and which contains a pigment and water, the method comprising: performing an aggregation property evaluation method for the pigment in which 10 parts by weight of an aqueous sodium chloride solution is added to 100 parts by weight of the pigment ink, the aggregation property evaluation method for the pigment including: performing first aggregation property evaluation in which the aqueous sodium chloride solution having an X % by weight concentration is added to the pigment ink; and performing second aggregation property evaluation in which the aqueous sodium chloride solution having a Y % by weight concentration is added to the pigment ink; wherein the concentrations of the aqueous sodium chloride solutions are set to fulfill a following condition (A) in the first aggregation property evaluation and the second aggregation property evaluation: 1.0â‰¦X<Yâ‰¦2.5â€ƒâ€ƒ(A).