What are you using? A blow torch?!? lol
Dark spots don't hurt anything; but I hope you are doing better than that by now.
Dark spots don't hurt anything; but I hope you are doing better than that by now.
Make sure the tip is clear of crud, I sometimes use a wet sponge and twist the solder iron tip into it, & wipe away the crud.No a 25w soldering iron and solder won't stick at all