Actually, of course, it's totally impossible.
So I wonder what's really happening.
I've been modifying a quartz clock, and needed to solder the very thin enameled copper wire that its motor uses. Repeatedly, I was finding that the wire broke while being soldered, for all the world as if I was melting through it.
I can't see how it can be anything other than copper wire in this application. It's the right colour, and low resistance is important to reduce battery consumption in the clock as originally sold.
Any thoughts?
Sylvia.