Need help with opacity

[Involute]

I've made a hollow cylinder I'd like to make transparent (simulating clear acrylic). I've painted all its surfaces Translucent_Glass_Gray and set the inner and outer surfaces to 14% Opacity. Nevertheless, as you can see in the attachment, the setting only seems to be affecting the outer surface. I should be able to see the part of the model projecting inside the cylinder. What am I doing wrong? This is SketchUp Pro 8 on Windows 7 x64. Thanks for your help.

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[fred.dy]

on dirait que les faces internes ne sont pas transparentes

[Involute]

En anglais, peut etre. Ma Francais nes pas tres bien.

[Dave R]

Paint the back faces with your transparent material.

Note: Green is my default back face color.

[Involute]

Thanks.

[LARV]

@fred.dy said:

on dirait que les faces internes ne sont pas transparentes

Kan du svara på svenska nästan gång så alla fattar vad du skriver...

[Involute]

Glöm inte Klingon.