Gum Rosin/Colophony/Natural Rosin/China Gum Rosin/Resin gum rosin has been general used for ink, adhesive, paint, ... , in the oil paint industry, the carboxylation reaction of resin acid is usually employed to produce resinate for further use ... resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double bond reaction. colophony rosin ...