RE/Gen CC-40 is a concentrated, stabilized, and buffered sodium chlorate solution designed to economically and safely regenerate cupric chloride etching systems utilizing the VIS-U-ETCH system and a secondary specific gravity control. The specific gravity controller utilizes water from the cupric etchant post rinse, thereby reducing rinse water volume requiring waste treatment. The use of sodium chlorate versus chlorine gas as the regenerative oxidizer, provides several safety advantages; most important of which is the elimination of chlorine gas storage and reduced potential for chlorine gas generation during replenishment.