Borax (Sodium diborate)30g
di-Sodium Hydrogen Phosphate (Na2HPO4)30g
Boric Acid 44g
Get your local pharmacist to make it up for you.
Use a child's paint brush to coat the cleaned areas on all
surfaces to be joined and any other areas of silver to be
protected. Heat gently with a torch (gas-air is all that's
necessary) until the treated areas are all uniformly white, place
the pieces of silver-solder in position then heat strongly. The
flux goes transparent just before the solder melts, and if the
parts to be joined are in close contact, the solder will suddenly
flash and the job is done. Pickle the work in your usual pickle.
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