It is a kind of natural resin, mainly composed of various kinds of resin acids, it can be dissolved easily in many organic ... yellowyellow brownyellow red Correspond to the Standard Glass Color Piece of RosinSoftening Point (R&B),°C, min767574Acid Value, (mgKOH/g), ... . Properties and uses: It is a kind of natural resin, mainly composed of various kinds of resin acids, it can be dissolved easily in ...