She bought a beautiful scarf in marengo, a dark grayish-brown with a hint of purple.

marengo 是一个颜色名称，源自1800年拿破仑在马伦戈战役（Battle of Marengo）胜利后所穿外套的颜色。这个词现在特指一种带有紫色调的深灰棕色。