"Blacklining"

Above: the difference between brown wash (left) and standard brown paint (right).
Below: Two Perry "Retreat from Moscow" figures before their white equipment straps are lined.

Above: white equipment straps blacklined with a charcoal wash.
Below: white equipment straps blacklined with a dark brown (bittersweet) wash.

COMPARISON: The backpack of the figure above had not been lined. The figure below has had the white leather on the backpack blacklined with a dark brown wash, making the details more striking and realistic.