Gum Rosin/Colophony/Natural Rosin/China Gum Rosin/Resin gum rosin has been general used for ink, adhesive, paint, food and rubber industry ... %max0.03%max0.04%maxAt present, most rosin product is used for the manufacturing of paper, paint, soap and ... rubber and printing ink, resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double ...