1.Rosin is the oil flowing from the trunk of pine tree. It melts into water at high temperature and becomes a massive solid after drying (there is no fixed melting point). Its color is burnt yellow and crimson. It is an important chemical raw material
2.Translucent ,pale yellow to brownish_yellow,angular,irregularly shaped,brittle,glassy pieces of different sizes the surfaces of which bear conchoidal markings 3. Soluble in aromatic and chlorinated hydrocarbons ,esters and ketone.partially soluble in
aliphatic hydrocarbons
aliphatic hydrocarbons
4. It is an industrial raw material for making paint, soap, paper, matches, etc.