Yes, it is the tube. I didn't paint the inside because I thought it'd be dark enough. And it was until I tried to do some beading on the end and when it got messed up, I had to turn it down lower than I wanted and went with this shape, just to get it smoothe again. So in the process of doing that, it allowed the tube to show through.
Awile back, I put a sign above the area where I work on gluing stuff up, that says "Don't forget to paint tubes- remember what happens when you don't? It ain't pretty!!!" That's been up for awhile, so now I apparently need to put up another sign to myself saying "hey dodo head- read the other sign!!"