On Oct 25, 11:13*am, isw wrote:
I have a little "kit" from Alpha Metals that I got years ago (and sadly,
I don't think they're available any more). It has a roll of silver-braze
wire and a tube of flux. Originally, the flux was creamy, but over time
it's gotten so stiff that I can't squeeze it out of the tube, plus, it
seems to have grown some crystals that make it hard to work with.

The flux contains potassium fluoride and potassium fluoroborate

I've heard it called 'soldering salts'; it will soften with water, but
after you apply it, you'll just have to drive off the water
anyhow (the less water, the better). The only easy way to get
a little more flux (if it's in a tube, the mix-water-in step is
difficult) is to find an arts store that has jewelry-making supplies.