Modern solder flux are scary. Period. Once, I ordered a professional flux and a quick read through the ‘consequences’ of it’s usage looked like a damn curse to me: Cancer, birth defects etc. You don’t have to be Ph.D. in biology to get that this flux must be a hell of a mutagen, so I decided to put it somewhere far away. Anyway, rosin was and is my flux of choice. It’s much safer, but still not ideal. You do have to filter the smoke anyways from their selection, unless you are fond of headaches. So, this project was just asking to be done:
