Specifically, the following compounds can be used: [0064] Cellulose derivatives such as ethylcellulose, and carboxymethyl cellulose; a polysaccharide and derivatives thereof; polyethylene glycol, cyclodextrin, macrocyclic amines, dendrimer, and crown ethers can be used as an agent for controlling ink characteristics. [0065] In addition to the above-described agents, an anti-fungi agent, an antisep