I know this has been asked before but I was unable to find a solution.
I have a digital PS1 pad PCB and have shaved the majority of the black stuff off of the copper contacts. In fact, it seems I’ve hit the green PCB on a few of the contacts. However, when I try to solder the contacts, the solder just refuses to stick.
For that matter, does the copper look like copper? It was sorta like the black stuff I shaved off went straight to the green of the PCB.