Firescoff is a combination fire scale preventative and flux-Replaces traditional boric acid-alcohol mix as a fire scale preventative and paste/liquid fluxes in one step •Integrated non-fluorinated flux for consistent soft and hard solder welding. •Perform multiple soldering operations without waiting. •Enjoy strong, non-brittle, void-free welds. •Greater control when reticulating with silver or gold. •Superior performance over boric acid & Batterns flux or paste flux. •Provides stray heat protection for gemstones. •Prevents scaling of metal alloys including gold, stainless steel, copper, and silver. •Warm water cleanup - less than 2 minutes in an ultrasonic cleaner. •Remove dangerous pickling acids from the workbench. •Alcohol-free - no dangerous flash, no frustrating burn residue. •No smell, no outgassing. •Significant improvement in safety over traditional methods 4.25oz bottle