The color circle, or color wheel, is an orderly and circular representation of the colors according to their hue or tone, where the primary colors and their derivatives are represented.
Its use is compatible with both subtractive color models and additive models. Wikipedia
Possible Basic Color Combinations
These are some basic color combinations suggested for lighting and shading of the colors marked "Initial."
It is recommended to introduce intermediate steps combining both colors (Lights + Initial or Initial + Shadows) at 50% or in another proportion.
Possible Combinations for Painting NMM (NonMetallic Metal)
These are suggested color combinations for painting some "non-metallic metal" effects.
These are only suggestions and it is recommended to combine the colors according to the surface to be painted and the desired effect.