... 04%maxAsh0.02%max0.03%max0.04%maxAt 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 industry ... and printing ink, resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double bond reaction ...