Allan,
I like gold myself
but was told by my mentors silver was best
then blue
and silver is by them best and least atmosphere,
in the weld puddle
so my mentors told me
1. silver
2. gold
3. blue
now times change and the old men I learned from are
not with us anymore
and all the info I use came from 1960 something
but I do not think metallurgy changed any
sincerely,
Kent