PRODUCTION OF MAGNETIC RECORDING MEDIUM

PROBLEM TO BE SOLVED: To decrease contamination of a head in a certifying process in the production of a magnetic recording medium by subjecting a substrate to texturing and then to electrolytic etching and further forming a magnetic recording layer on the substrate. SOLUTION: The electrolytic etching is carried out in an aq. soln. of hydroxycarboxylic acid. As for the hydroxycarboxylic acid, lower hydroxycarboxylic acids having 3 to 6 carbon atoms such as lactic acid, malic acid, tartaric acid and citric acid are preferably used. These acids may be used in a single state or a mixture. The concn. in the soln. is usually controlled to 1 to 30 wt.%, preferably >=2 wt.%. and more preferably 2 to 20 wt.%.