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activated rosin flux

A flux having a resin or rosin base and containing an additive to increase wetting by the solder.

rosin, colophony

A resin obtained as a residue in the distillation of crude turpentine from the sap of pine trees (gum rosin) or from an extract of the stumps and other parts of them (wood rosin).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.