Johnson's Activated Liquid Rosin Flux is a homogeneous solution made with electronic grade rosin with a blend of solvents chosen for high tolerance of their vapor concentration in air, plus a small quantity of a control etching ingredient that dissolves the tarnish film of solderable metals, thus enhancing the natural activity of the rosin. Johnson's flux is characterized by its ability to remove even tenacious tarnish films, making it suitable for use in soldering electronic assemblies where post-soldering cleaning is either used, or not required, as well as electrical connections and even architectural copper or coated roofing metals. For most applications these flux residues need not be removed from the workpiece. Under normal conditions of usage they are non-conductive, non-corrosive, non-hygroscopic and resistant to fungus growth.