This is just to show you a syringe type tube of solder flux paste and what you can expect to get if you buy a syringe type tube of solder flux. <br /><br />Using flux when soldering can <br />a) Help chemically clean electronic parts. <br />b) Transfer heat and help the solder flow. <br />c) Make soldering easier. <br /><br />Extra flux can even be helpful with Multicore Solder which has in built flux. <br /><br />Remember there are different typed of solder that may require different types of solder flux. <br /><br />Clean excess old flux off after parts are cooled. <br /><br />Electronics, Electronic components and Electronics Circuits. <br />http://www.acomputerportal.com/electronics.html