It serves the purpose of excluding oxygen from a solder joint as it solidifies, and in most cases its base is derived from pine rosin. Most of us just buy flux, but [pileofstuff] is having a go at ...

Solder comes in many sizes and compositions depending on the application. For electrical purposes, electrical lead free ...

It did a fine job cleaning all but the crustiest rosin flux without collateral damage. In the video below, [Steven] goes through a few more brands with similar results, and we were encouraged ...