Duotoned

On hair coloring the magazine had this to say: “[…] The man who doesn’t like to admit that he’s darkening his gray by showing up suddenly with duotoned hair can do it himself gradually.”

Source: wiktionary

Toward the late ’Fifties we began to appreciate and snap up the few remaining Grand Classics: Duesenbergs, Stutzes, Marmons and multi-cylindered Cadillacs/Packards/Lincolns, and in the early ’Seventies the objects that moved us were duotoned and chromey, expressions of that period of unbridled optimism colloquially known as the Fabulous ’Fifties.

Source: wiktionary

Or more exactly, this night, because there is a huge, nearly full autumn moon, all cats are duotoned, like the trees, between planes of absolute black and pure silver. […] she is going to walk out of her kitchen door into the moon-flooded, late autumn night, cross the unnamed road between her white clapboard house and Jason’s, dappled silver and black herself as she walks below the duotoned leaves, let herself in the front door and climb the back stairs to his bedroom where she will wake him and sweep him off his feet.

Source: wiktionary