Thanks for sharing! Great observations! Spit, huh? I'll try it! Up
to this point, Rio's My-T-Flux has been my favorite for fusing
Argentium Silver. I use a solderite board. I have fused with a creme
brulee torch at Rio's Catalog in Motion in Tucson (sorry--I won't be
there this year) and have also been successful with Smith's oxy/air
torch as well as the Smith Little Torch. I choose the tip size
according to the size and gauge of the base metal being fused to.
I think the gold granule that melted into the AS was probably 14K,
so, as you say, it makes sense that higher karat golds would have
this problem less.