I've seen, but yet to order this from Monsterslayer, but am
tempted, it seems to be a copper solder solution: CU-FOS-FLO #7 20
Ga wire Hard Solder for Copper and Brass Melting Temp: 1310*F.
Composition: 92.75% Copper, 7.25% Phosphorus Joint Color: Light
Copper @ http://www.monsterslayer.com/Metals/Solder.aspx
I really dislike the copper solder. It is rigid and unforgiving. In
my experience it creates a brittle join. If the area being soldered
is clean and meets up perfectly, you shouldn’t have a visible join
with the silver solder once it’s cleaned up. If you want to try the
copper solder, contact me off-line – I bought a bunch of a while
back, finding myself quite intrigued. Now I’m just disappointed.
Anyone have better luck with it?