In the selective soldering process, dross can be detrimental. Dross (the term as used here encompasses all surface contamination) is created in conjunction with the presence of oxygen in two different areas of the process, and by separate means. Each must be dealt with differently to prevent problems. Conventional dross, as most people know it, is created when the solder basically tumbles back into the solder pot from the nozzle. As the solder flows back into the pot, down the drop area from the nozzle tip, it mixes with the atmosphere and oxidizes to create a chowder-like substance known as dross.
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