Multiple material on a label! I made a model of a cosmetics bottle with a label on it, 



regarding my design the logo should be in Silver hot foil texture so I made the design picture as PNG.

Then applied it on the label then the silver material under it, then the last material should simple diffuse white material as the adhesive paper back

Now when I apply the three materials on the label, the silver foil material doesn't appears on the preview render but the paper back material do. 

But when I remove the paper back material the silver foil appears, 
but I need them all to appears cause the are a transparent bottles not only what plastic bottle,

thanks in advance.
I think I've understood what you asked.


What you need then is a mix node for your label/Silver using the backfacing of your label's material. Here is the node setup : 

This allows you to use a specific material when your look at the back side of your material.