Inventor Part Coloring

Okay so some of my parts when i put them as Steel and Zinc they change to a nice shiny color, closely like the real parts. But some of the parts turn into this darkish grey color. Any tips on how to get them to all be nice and shiny?

If you make the outsides aluminum, they will be shinier. You can also turn reflections on (or make it greater) under the view tab.

You might also want to change the view you are in in the Autodesk Inventor screen. Changing it to a realistic view with shading and all the other features turned on really makes a difference. One major thing to spot is the fact that clear in normal view is not clear, but in realistic view, it is next to invisible, only a small diffusion/diffraction of light is noticeable on highest quality.