Is there any metal that can't be fused?

[jeannette]

More interested in the safety factor rather than what happens with colour etc...
So will anything explode or anything mad like that?
Thanks, on that cheery note!!
Jeannette

[noora]

Check the melting points, I expect there are metals or alloys that could melt at fusing temperatures (solder and such).

And I wouldn't try magnesium, it might burn But if you stick to metals you'd normally find in a home or among your crafting stuff rather than in a chemistry set you should be fine as long as the metals don't melt.