Gum Rosin
Chemical industry Rosin commonly called colophony or Greek pitch (Pix græca) is a solid form of resin obtained from Pine Sap and many other plants, especially conifers, produced by heating fresh liquid resin to evaporate volatile components terpena liquid.
With semi-transparent colors and varies in color from yellow to black. In room temperature the rosin is brittle, but it melts against the stove-top temperature. It mainly consists of unequal amber acids, especially abietic acid. The term "colophony" is derived from colophonia resina or "resin from pine trees," one ancient ionic city.