It’s pretty certain that every light bulb you have ever screwed in or turned on has had a dab of a metallic solder on it that was made in Paoli. The manufacturer of that dot, originally American ...

[GuShH] wrote a guide for making your own rosin-based solder flux. According to [Stephen] — who sent in the tip and tried this method himself — is works well, it’s cheap, but you will need to clean up ...