METHOD OF ELECTROCHEMICALLY ROUGHING PLATE, FOIL OR BAND-FORM MATERIAL OF ALUMINUM OR ALUMINUM ALLOY

摘要

Aluminum is electrolytically grained in an aqueous solution of nitric and oxalic acids to provide a surface structure suitable for use as part of a lithographic printing plate. The electrolyte may also optionally contain boric acid and/or aluminum nitrate and/or hydrogen peroxide.