Massed shot? Don't think I've gort a space big enough but just for you....
Chips, D? I paint a 'scrape' with a very light version of the base colour then either leave it as that or fill the centre with a dark, rusty brown (Vallejo German Camo blk/brwn) leaving the light base colour around the edges. depending on the colour 'temperature' of the base colour I'll add a little dk.blue to the blk/brwn to 'cool' it and create visual depth.