Looks like you are right. I wonder if it discolors the SS cable -turns it black after soldering or if the solder helps this at all?

The thing to remember is that the fumes can be really toxic. Zinc inhaled is bad and you can get really sick -even permanently wreck your lungs. My dad has COPD pretty bad from years of being an electrician and a welder. Welding galvanized metal and SS is seriously bad crap. Being tied to an oxygen hose 24/7 is not the way I want to spend the rest of my life...

Use adequate venting!

Found this in there too: "Superior RubyFluid Stainless Steel has a two (2) year shelf life."