xyethylene fatty amide, polyvinyl alcohol, polyacrylamide, cellulose derivatives such as carboxymethylcellulose, carboxyethylcellulose and the like, and polysaccharides and the derivatives thereof. [0127] It is preferable, without any limitation, that a hydrophilic group of the pigment dispersant is carboxylic acid or the salt thereof. [0128] A neutralization amount of the pigment dispersant is pr