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Dave, one thing you could try to make the tracks more brown would be a pastel wash. Grind some pastel chalk into a container and add some paint thinner (or even water) to it. Brush this over the tracks and the dust should build up in recesses, etc. It can look pretty neat.
Nic
Nic, I used this exact technique on my Panther's tracks, it did turn out quite well.
Andrew
