Check the listing for details. Superior Flux RubyFluid Liquid Soldering Flux 2 oz Bottle. Condition: New. Listed at 11.90 USD. DESCRIPTION: RubyFluid is a water-soluble flux formulated for soldering. The flux is a non-fuming, self-cleaning soldering flux. The flux exerts a strong scavenging action to remove oxide coatings and other impurities from the metal surface to produce strong joints. Pre-cleaning is not necessary under most conditions. RubyFluidis excellent for use on Copper, Brass, Ferrous Alloys and many more metals. It is not recommended for Aluminum and Magnesium. Since 1907 RubyFluid has been a staple soldering flux for workers, craftsmen and artisans in the applications of stained glass, plumbing, roofing, and sheetmetal. * Non-Fuming and water-soluble * Exhibits excellent capillary action * General purpose flux. * Easy-to-use. Produces strong, durable joints without corrosion or dangerous fumes. * Made from finest material obtainable. * Causes solder to flow in thin film. * Contains no lead. * Adheres quickly and stays put.