What kind of wire is this?!

I have found this wire before & thought it was Stainless steel wire because it was a Silver colour right thru.

After looking closer at it, I see Copper.
So real close look tells me its Copper wire with a Tin coating. As I was cutting thru the wire, it was smearing the softer tin across the copper wires cut face.
Thats why it looked Silver all the way thru.

I have found this happens a lot when I do this. For instance I cut thru the Silver coloured backing plate on a flat transistor & it looked Silver all the way thru.
But when I scraped it across a knife sharpening stone, the Copper colour came back out.

Yeah yeah, yah just smearing the Tin coating over the face of the Copper wire.



Its Copper wire.