Developer being less susceptible to oxidation and method for preparation thereof

Abstract

Provided are an oxidation-suppressed developer which is less apt to be oxidized and a method of manufacturing the oxidation-suppressed developer. The oxidation-suppressed developer contains a divalent-trivalent iron salt in a dissolved state. The oxidation-suppressed developer consists essentially of a compound which is obtained by performing neutralization after magnetite is dissolved in concentrated hydrochloric acid and by adding a crystal obtained by concentrating this solution to a concentrated hydrochloric acid solution of magnetite. The divalent-trivalentiron salt is contained in a concentration of 0.25×10−8 mg/liter to 0.25×10−10 mg/liter.

Dependencies are inferred from the claim text.