For most painting, hot pressed linseed oil requires further refining, the usual commercial treatment is to mix sulphuric acid and water, this removes the bulk of undesirable impurities and improves the colour. The boiled linseed oil has had hot air blown through to radically improve drying time. Raw Linseed Oil is the original oil polish reaching back many centuries in English furniture manufacture, it is hard wearing and particularly suited to fine woodwork for a mellow patinated finish. Traditionally used on cricket bats.