... natural resin, its general formula is C20H30O2. Gum rosin also called colophony, is a solid form ... -transparent and varies in color from yellow to black. At room temperature rosin is brittle, but ... of different resin acids, especially abietic acid. Gum rosin is an important raw material for the ... , coating, inks, rubber, soaps, paper etc. Gum rosin of our packing details:In galvanized iron drum, ...