duocolor

If daylight is present, the resulting pictures may show a duocolor effect—the highlights and middle tones will be correctly rendered but the shadows may reflect the daylight and photograph quite blue.

1938, Journal of the Biological Photographic Association, page 71

A duocolor scheme, a combination of wine and light tan, is used as a decorative effect.

1948, Gas Appliance Merchandising, volume 20, page 33

[…] correct a lack of color contrast balance in a slide or print material, to lighten the shadow areas of a print, or to obtain duocolor or monochrome effects.

1980, Peter Krause, Henry A. Shull, The Complete Guide to Cibachrome Printing, Ziff-Davis Publishing Company, →ISBN, page 117

Oh come on! Saying you can't make a tricolor deck without multilands was bad enough, but now you're saying you can't even make a reliable duocolor deck? _Just how bad are you_ at deck construction?

1995 May 9, Guy T. Rice, “Re: Disappointed in 4E....(Multi-lands)”, in rec.games.trading-cards.magic.misc (Usenet), message-ID <3onbt4$rtv@blackice.winternet.com>

With the duocolor job, white at the scalp and fuchsia at the nape, she looks like a grumpy powder puff.

2017 January 10, A. G. Howard, RoseBlood, Abrams Books, →ISBN