Many thanks.
The answer is
jain!
The basic metallic tones are - as always for my paintjobs- enamel colors. In this case, I used a bunch of Humbrol colors like Copper, Bronze, Gold and (chrome) Silver. First comes the darker shades like bronze, and its washed with Citadel washings (Agrax Earthshade). Finally, I drybrushed some 50/50 mixture of Gold and Chrome - thats it.
