described is a process for improving a photo sensitive material of polyvinylpyrrolidone type by improving its chemical and ability to maintain a straight line property even after etching . the present invention proposes such that at least one of a nitrate , a sulfate or a hydrochloride of two or three valanced metal ions is added to polyvinylpyrrolidone in the ratio of 0 . 01 to 10 % and then well stirred with the appropriate amount of an aqueous ammonia at the normal or room temperatures to obtain a ph of 7 to 10 thereby producing a metal hydroxide .