Painting transparent pieces inside or outside?

After a bath in future,I'd paint the inside with the trascent color,then maybe back that up with black/silver but that's just me

Meant to say translucent, sorry ,also it kinda depends if you want  to add lights to the interior

Not going to add lights, just looking for the solution that will yield the idea of transparency, while still clearly showing the color.

Hi:

  I have found for that kick butt translucency you are looking for do this .In the center of the pieces , after tinting the color in ,use a small piece of foil chrome ,you have made .why ?

 Well it has to be backwards .(ie.shiny side down , as it were .) Then overcoat with the last coat of color ONLY on the very center of the piece , on the outside.If your tint is a wash , then dip in FUTURE and " VIOLA" one very nice piece .