You will probably need to use some other colours to get a good effect, particularly blue and purple.
The best way I can describe it is this... All surfaces are reflective. What distinguishes them (prominently) is the colours that they reflect and the amount to which reflections get blurred by surface roughness.
- Chrome for example is like a mirror, it will reflect all colours with zero blur.
- Gold reflects mainly yellows and browns, with a little bit of blur.
- Green Paper reflects greens, with maximum blur. It might be tempting to think of paper as non-reflective, but obviously this is false. If paper wasn't reflective then you wouldn't be able to see it at all. Green paper by definition reflects green.
For the chrome the best way to interpret the reflections would likely be as Sky Earth
NMM, this is kind of obvious.
What maybe isn't obvious is that Sky Earth
NMM is probably also the most accurate way to understand and interpret the reflections for gold and paper too. Only you will want to limit the colours and make the reflection more blurry to achieve the desired effect.
For gold this will mean tinting your Sky and Earth yellow, and blurring it into more of a gradient. For paper you will want to limit the colour to something quite specific and blur it so much that it is uniform.
If you want to paint Silver than you are going to want a surface that reflects all colours, with some blurriness (like gold). If you take this back to the Sky Earth
Nmm blurred, you will see that the colours are primarily Blue and a ground colour Brown/black/grey.
I would use purple into grey here as the ground colour because I think that has a more metallic look, and emphasizes the idea of blue and brown being blurred together a bit. Might also be a good idea to look at some suites of armour and silver objects as a reference.
Start with this one