HOW TO USE BORIC ACID AND ALCOHOL AS A FIRE COAT PREVENTATIVE
Coating your sterling silver, goldfill, or karat gold with a
fine particle coating of powdered boric acid greatly reduces fire scale during
the annealing and soldering (brazing) processes. When heated it creates a barrier, preventing oxygen from reacting with
the surface of the metal.
A glass pint canning jar with a sealable screw top works well for
making and storing this
Add enough powdered boric acid to denatured alcohol so the acid particles are
half the volume.
When settled after shaking, the bottom half of the mixture will be white and the
top half will be clear alcohol.
For each use, shake the jar to bring the powdered acid particles into suspension
then immediately dip your jewelry piece.
Place the piece on your brazing area surface and light the alcohol fumes with a
kitchen match or bar-b-que lighter.
Don't dally around as the crystals quickly settle and they will also quickly
wash downward off your jewelry if left sitting.
The idea is to achieve a complete, even coating of the boric acid particles all
over so you want to shake, dip and evaporate ASAP.
If you don't achieve an even coating on the first try, just re-dip and ignite.
Be careful not to set your jar of solution on fire. Cap it and place the jar a
safe distance away before lighting your torch.
While most fluxes contain boric acid, you should use brazing flux as you
normally would.Always wear eye protection when working with chemicals, and
keep all containers well labeled.
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