The halides do increase the activity, but also increase the corrosiveness somewhat and lower the electrical resistance of the residues. The liquid activated fluxes should not be splashed onto areas which are not heated or from which the residues cannot be removed, because when applied to a surface and dried these fluxes are somewhat corrosive and have comparatively low resistance.
But when heated to soldering temperature, most of the active ingredient is lost and the residue is less corrosive. The electrical resistance of the residue is almost as high as that of rosin. Residues may be removed with alcohol, trichloroethylene or proprietary solvents. Rosin fluxes may be used on copper and copper alloys.
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