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Rosin, also called colophony or Greek pitch (Latin: pix græca), is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components.
G 1552 (OTTO) Gum rosin Cas 8050-09-7 - used as a flux in soldering and in making paints and varnishes.