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Radio Record, Volume II, Issue 48, 14 June 1929, Page 5

F the flux from a_ newly-soldered joint. is wiped whilst it is hot it comes away cleanly, but if left until cool it becomes sticky, and it is impossible to remove it from the underside of wires, etc. One of the greatest disadvantages of soldering flux left behind on a joint is that dust will settle upon this in time, and so make a conductive path which may destroy the advantages of correct insulation.