... ) , max0.020.030.04 Usage: Uses of Gum Rosin: At present, most rosin product is used for the manufacturing of paper, paint ... , soap and printing ink. Since rosin is easily softened and oxidized, in the oil paint ... and printing ink, resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double bond reaction ...