For all my models I use the Airbrush color from Vallejo (Model Air).
basic hull color
Steel 71065 (70%) + Yellow 71002 (15%) + Olive Green 71007 (15%)
I love the Aztec look of this vessel as it can be seen in the remastered TOS episodes.
dark Aztec color
Steel 71065 (30%) + Olive Green 71007 (70%)
light Aztec color
US Grey Light (30%) + Thinner (70%)
Aero Shine Silver (100%) from Schmincke
The end caps of the Warp nacelles and the Torpedo launcher is 100% Steel 71065.