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Resin used in fluxes. It is obtained by distilling the turpentine contained in the balm of coniferous trees and then separating the volatile turpentine oil so that pure resin remains, the components of which are very different depending on the type and origin of the wood. In all cases, rosin is a yellow-brown, porous solid containing abietic and pimaric acid which is highly soluble in alcohol, ether and benzene, but not in water. It softens at 80 °C and melts at 90-100 °C. See also Rosin.