After getting some sage advice from Sessin, Otto Frei’s Technical Advisor, on preheating the metal to between 250 - 400 degrees F, before spraying Firescoff on, this is my favorite flux. The problems of fire scale are no longer plaguing my silver. Heat, spray, watch it crystallize into white crunchy stuff, reheat, solder, quench, wash in warm water and spend your time doing something more fun and productive than cleaning fire scale. Helps eliminate the pickle and that’s a good thing all around.