Can't make material Transparent? I'm doing an outline effect in blender cycles using a displacement modifier, duplicate mesh, and the backface option on a geometry node.

Here is a picture of my set up:


The displaced duplicate mesh is placed directly on top of the original mesh. The original mesh has a red transparent shader, but isn't transparent at all.

How do I get it so that internal mesh becomes transparent? Any advice would be appreciated, thank you.
Your transparent material is actually transparent and only has the red tint as per usual with colored transparent shaders. The problem is, that we can see the backfacing white object behind it.

To hide the backfacing object behind the inner geometry, use the ray depth information as mentioned by gandalf3 in the comments.