Nice and clean looking cups Donnie!
This may sound a bit strange but you gotta love the inside's of Donnie's cups!
Bri
Bri, this is a sore subject for me. I believe the inside of the cups should be non-reflective and unpolished. When cups come off the lathe, they have burned in greases inside them. If you've ever seen cheaply produced cups with a black grimey interior then you know what I'm talking about. Brass is notorious for this and you will see it in some copper cups too.
So the interior needs cleaned up yes, but it shouldn't be reflective.
I'll tell you that I use a simple glass beading process to "blast" all the grime out of the inside of the cups and that process leave the interior a flat, matte, non-reflective finish. It's raw copper and can be restored to new condition, cleaned up, with any copper cleaner (but not a polish), like a vinegar and salt solution or Wright's Copper Cream. It will turn a patina in time if you just leave it alone too.
I got tired of flashing the color of the balls off the inside walls of the cup when the cup is mouth up. In my routine, I do Aldo Colombini's cup toss and the audience doesn't realize that there is a ball inside the cup when it is tossed end over end from hand to hand - unless the color of the ball flashes off the inside of a shiny cup interior. I saw it myself on video. With this inside finish, that doesn't happen anymore.
So guys that don't like this inside finish are missing the point. For me, the point is this: Finish the cup, clean the interior to a raw unblemished surface. And assist with the illusion at the same time! It's just one less thing to worry about during a stressful or risky routine.
Oh, it's also less expensive to do this finish than to try to polish the interior of the cup so it brings the price down.