Patent ID: 7101657

Claim:
A developer comprising at least one carbonate and at least one hydrogen carbonate, and at least one surfactant selected from the group consisting of nonionic aromatic ether type surfactants represented by the following general formula (1-A) or (1-B) and anionic surfactants selected from the group consisting of compounds having at least one of anionic groups derived from sulfonic acid or anionic groups derived from sulfuric acid monoesters in an amount ranging from 1.0 to 10% by weight; and having a pH value ranging from 8.5 to 11.5 and an electrical conductivity x falling within the range: 30<x <100 mS/cm: wherein, R 1 and R 2 represent a hydrogen atom or an organic group having 1 to 100 carbon atoms, respectively: p and q represent 1 or 2, respectively: Y 1 and Y 2 represent a single bond or an alkylene group having 1 to 10 carbon atoms, respectively: r and s are 0 or an integer ranging from 1 to 100, respectively, provided that r and s cannot simultaneously represent 0 and that when either r or s is 0, r and s cannot represent 1: and r′ and s′ are 0 or an integer ranging from 1 to 100, respectively, provided that r′ and s′ cannot simultaneously represent 0 and that when either r′ or s′ is 0. r′ and s′ cannot represent 1.