Ruby Fluid® soldering and tinning liquid flux. 2 Oz (.06L). Plumbers, workers in brass, copper, tin, steel and stained glass will achieve superior results with this easy to use product. Produce strong, neat and durable joints. Ruby Fluid® allows solder to flow in a thin film. Adheres quickly and stays where it is applied. Also available in paste (Forney 38125). Carded version is Forney 60301.