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Solder flux is the necessary ingredient in any solder operation.
First it cleans the metal, then helps the solder flow properly when heated. It can be applied separate from the solder or be a part of the solder, contained in the core of the solder. There are different types of flux, first there is Acid. Acid flux is great, used mostly in commercial operations because it can be dangerous, and any excess flux MUST be completely removed or everything will corrode. The second flux most used is the Rosin flux, used a lot in the electronic business.