Brass tubes showing... gotta order some of those others ones. Does paint work? I used Gorrilla glue which might add color too... would you use CA for the transparent acrylics?
I have painted tubes with white, silver and black enamel depending on the color of translucent blanks. Sand first just like for the glue. Let it dry for at least 24 hours before you expose to glue. The silver tubes are nice. I use CA on all my acrylic tubes and most wood tubes.