On Sat, 26 Mar 2016 15:44:09 -0700 (PDT), DerbyDad03
wrote:

I'm going to be building something - not plumbing - with 3/4" copper pipe. As you can see from
this image, the pipe is a different "color" than the fittings. The fittings are bright copper, the
pipe itself is much duller.

Anybody know why that is or more importantly, how to shine up the pipe so that it matches
the fittings?

Wrot copper fittings are cold formed in a mold. Pipe is extruded. If
you don't lacquer them or something they will both tarnish.