Brake Lights

Green with sky blue & pink stripes with yellow dots!

My wire is copper colored.

And, if you could only learn how to search, you would have found, "About 643,000 results" in (0.19 seconds) on the internet.

This is not a free reference service for lazy people.

Vehicle Trailer Wiring Harness, Adapters and Connectors | etrailer.com

mine is red.

The wire or your rear? (Sorry, just couldn't resist)

Probably the opposite of the brake light wire in the front.

The other thing to always check is whether it's a port brake light (that's red wire) or starboard (that's green), except if it's a car designed for driving on the wrong side of the road (like in the UK) where the port wire is green with a yellow stripe and the starboard wire is red with white stripe. I think. Of course, all this is modified if there's a nor'easter (known as the any port in a storm code).

<...wrong side of the road (like in the UK)...>

Cheek!

Unless the vehicle has been modified it will be the same as the one stated in the wiring diagram at the back of the Haynes manual (other car repair manuals are available) for that make and model.