There are two basic methods that fluxes use to eliminate oxidation, they
either dissolve it into "solution", or they reduce it back to the metal.

If it is reduced back to the metal, it clearly "disappears", but if in
solution, the vendor is supposed to be clever enough to make it not re-
deposit.   The old style rosin fluxes "dissolved" the oxide, by reacting a
(rosin) fatty acid, with the metal in the oxide, and it got pushed aside by
the incoming solder.

Which mode your flux works in, clearly depends on which flux you use.
Many fluxes use both modes.

Rudy Sedlak
RD Chemical Company

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