Hello Orchid family. I am having a problem with a residue after
pickling on sweat soldered pieces. On the edges of the piece
soldered on are left areas that seem like hardened flux that won’t
pickle off. I have used Pripps flux as well as cupronil and I use
Sparex for pickling. I can only get it off with a silicone disc
abrasive. Am I using too much flux? I can’t figure out what is
happening. Any help is greatly appreciated.