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Rosin is a type of flux, which is an auxiliary substance used in soldering metals. It is a natural resin obtained from coniferous trees. The main purpose of rosin is to chemically clean soldered metal surfaces just before and during soldering. A thin, invisible layer of oxides covers each metal surface in air. This layer prevents molten solder, most often tin alloy, from adhering properly to the surface and forming a strong and electrically conductive bond. When heated with a soldering iron, rosin melts and its mild acidity dissolves and removes this oxide layer. This process reveals the pure metal to which the solder is already easily attached. At the same time, the molten rosin protects the cleaned surface from re-oxidation by airborne oxygen during soldering and improves the fluidity and flow of the solder over the joint. The rosin can be in solid form, into which the hot tip of the soldering iron is dipped, but very often it is already contained as a filling inside the "tube solder", so that it is automatically placed on the joint together with the tin. After soldering, it leaves a characteristic sticky residue on the joint, which in some cases it is recommended to clean with, for example, alcohol.

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