"What colours would you recomend to bring this out ?"
Do you mean an actual filter coat or a wash? For the wash, I usually go for raw or burnt umber ...... and for ww2 tanks that tend to rust a little, an extra pin wash on selected areas with burnt sienna. I never use turps for washes. The best results I can get, and has never let me down is Humbrol enamel thinner. But then I only use enamels and oils for washes. This works for both. For a filter ... as its so light I can use anything .. if what you want is to blend the base colour and lighter patches together.... the base coat, the lighter coat, greys, umber, ochre, greens, earths, buffs, dusts ......... a few works exceptionally well together. For filters i use the above but only more diluted and even tamiya colours diluted with isoproponol.
Hopefully this helps ... Im not 100% sure of what you are asking?