why the material not copied I have 2 mesh with color white and green. The white (no color on it). I want to copy the green material on to the white mesh. Just i selected the white and then green and in the properties tab i click on copy to material. It copy the material to the mesh but when i click on preview render it show glass material on it. Whats the magic. Any suggestion. Thanks
Your material uses the Ray Length. The thicker the object is, the more green and dark it gets.

The left object has very little thickness, because you added a Solidify modifier to it. Add more thickness to it, by disabling the solidy modifier to see a similiar color as in the right object.