I've just redone my t-34 in tamiya x-61 and have done a very subtle lighting of the panels ect
what colours would you recomend to bring this oout and what medium should I use oil/enamel/acrylic and airbrush/paint if oil/enamal what should I use to thin it? dont want to use pure turps as it's melted my kits before

"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?

cheers plastic,
was just wonderingwhat the best colours to use were and some thing thats not going to eat into my kit like a hungry dog i was just unsure what colours to use with the filter as I'm not very good at colour perception and its it best doing the filter with a brush/airbrush