Gum Rosin/Colophony/Natural Rosin/China Gum Rosin/Resin gum rosin has been general used for ink, adhesive, paint, food and rubber industry Name of IndexXWWWGNMKColorSlight yellowLight yellowyellow DeepyellowYellow brownyellow redAppearanceTransparentSoftening Point(R. & B.)76°Cmin75°C min74°C minAcid Value mg KOH/g166 min 165 min 164 minUnsaponifiable Matter5%max 5%max 5%maxInsoluble Matter in ...