It is a kind of natural resin, mainly composed of various kinds of resin acids, it can be dissolved easily in many organic solve 1. Specifications Gum RosinGradeXWWWGNMKAppearanceTransparent SolidColorslightly yellowpale yellowyellowdeep yellowyellow brownyellow red Correspond to the Standard Glass Color Piece of RosinSoftening Point (R&B),°C, min767574Acid Value, (mgKOH/g), min166165164Alcohol ...