Im no chemist, But soldered many types of solder plumbing/heating.. The white paste and sometimes powder FLUX for silver/braze refridgeration/dental pipe, Helped keep modern lead-free solder on steel wire cable, the cable and solder don't blend , I think its all about the Flux.? In the old Harley rags was often a Make your own cable kit! Theres diff antimony of refridge soder, I used the lower one, It worked for me but I don't build tree stands either! lol