Last Copper Question

Just a simple one. Muchly appreciated for any cooperation on helping me!



Basically,

Why are certain coppers different colours to others.

For example I have 2 balls of copper below. One on left is darker than the shiny one on the right? Does the right one have some kind of casing because if I scrape it, it becomes shiny like the left one



Explanation please?

The wire might be burned. Where did it come from.

If it is from a motor or transformer, it might be coated with varnish (electrical insulation). Or it may just be slightly oxidized.

Originally Posted by poundigity24

The wire might be burned. Where did it come from.

I don't think it is burned and I found it down the woods in a motor.

Originally Posted by fnord

If it is from a motor or transformer, it might be coated with varnish (electrical insulation). Or it may just be slightly oxidized.

Okay thanks, it may indeed be varnish. Sounds more promising than the oxidization. Do you know if the copper is coated in varnish it will sell for less?