Pits after soldering

i relise that if pits in the gold are there they are from casting
but i have noticed that after cleaning up the casting there are
none visible but yet when i solder it seems to bring them out. i am
wondering how to aviod this, thanks

Are you using Hard or Easy solder? I have found that easy solder
pits pretty bad sometimes where hard does not. But…any solder
will pit if you hold the torch on it too long.

Steve Dickey
@Steve