I was trying for something kinda see through with little swirls of black to grey showing through the white. Didn't quite make it to black but the result is still pretty cool. The backround is a little harsh but the pen color is pretty much spot on.
The swirls do make it look like wisps of smoke. It looks like a blank that will capture the owner's imagination for some time. Great effort. Thanks for posting it for us to see.
It's Alumalite. I don't use PR much because of the smell. I was happy to get the translucent effect in that blank because a lot of times the pigments can make the blank look solid.
I used a dark grey automotive primer by Rustoleum. I've found that primers stick much better to the tubes. I also reverse painted the tubes with the same paint.