Whats the difference between “Rosin Core” and “Acid Core” solder?
Rosin core solder contains rosin, which is usually a purified pine tree sap, as a fluxing agent. The flux can be inactive, in which case it simply covers the area being soldered during the process (to keep oxides from forming), active or mildly active , in which case it will remove light-to-medium oxides that were present before the soldering process began, or highly active, which will remove almost any oxide or stain on the part and allow a good solder joint to be made. Rosin Core solders are active only during the soldering process. Activity is halted or greatly reduced after the heating process is finished. Rosin fluxes are non-conductive, and for this reason, they are the choice for electrical and electronics connections.
